Title: Democratizing Innovation Creator: Eric von Hipel Rights: Copyright (C) 2005 Eric von Hippel. Exclusive rights to publish and sell this book in print form in English are licensed to The MIT Press. All other rights are reserved by the author. An electronic version of this book is available under a Creative Commons license.;
License: Creative Commons US Attribution-NonCommercial-NoDerivs license 2.0. http://creativecommons.org/licenses/by-nc-nd/2.0/legalcode Some Rights Reserved. You are free to copy, distribute, display and perform the work, under the following conditions: Attribution, you must give the original author credit; you may not use this work for commercial purposes; No Derivative Works, you may not alter, transform, or build-upon this work. For reuse or distribution you must make clear to others the license terms of this work. Any conditions can be waived if you get permission from the copyright holder. Your fair use and other rights are in no way affected by the above. Publisher: SiSU ‹<text:a xlink:type='simple' xlink:href='http://www.jus.uio.no/sisu'>http://www.jus.uio.no/sisu</text:a>› (this copy) Date created: 2005 Date issued: 2005 Date available: 2005 Date modified: 2005 Date valid: 2005 Date: 2005 Classify isbn: 9780262720472 Sourcefile: democratizing_innovation.eric_von_hippel.sst Filetype: SiSU text 2.0 Source digest: SHA256(democratizing_innovation.eric_von_hippel.sst)= 625fd5397672e945dd2c32f46c204d4394f3bc7d76752e0c62dc098011d4c927 Skin digest: SHA256(skin_di_von_hippel.rb)= 49fa32a84e016bbae921184a2f2566879821f0c554fb5b85ee329fb2c652c7d4 Generated by: Generated by: SiSU 2.8.2 of 2011w10/5 (2011-03-11) Ruby version: ruby 1.8.7 (2011-02-18 patchlevel 334) [i486-linux] Document (dal) last generated: Fri Mar 11 09:15:54 -0500 2011 1 Democratizing Innovation,
Eric von Hipel 2 Democratizing Innovation 3 1 Introduction and Overview 4 When I say that innovation is being democratized, I mean that users of products and services---both firms and individual consumers---are increasingly able to innovate for themselves. User-centered innovation processes offer great advantages over the manufacturer-centric innovation development systems that have been the mainstay of commerce for hundreds of years. Users that innovate can develop exactly what they want, rather than relying on manufacturers to act as their (often very imperfect) agents. Moreover, individual users do not have to develop everything they need on their own: they can benefit from innovations developed and freely shared by others. 5 The trend toward democratization of innovation applies to information products such as software and also to physical products. As a quick illustration of the latter, consider the development of high-performance windsurfing techniques and equipment in Hawaii by an informal user group. High-performance windsurfing involves acrobatics such as jumps and flips and turns in mid-air. Larry Stanley, a pioneer in high-performance windsurfing, described the development of a major innovation in technique and equipment to Sonali Shah: 6 In 1978 Jýrgen Honscheid came over from West Germany for the first Hawaiian World Cup and discovered jumping, which was new to him, although Mike Horgan and I were jumping in 1974 and 1975. There was a new enthusiasm for jumping and we were all trying to outdo each other by jumping higher and higher. The problem was that . . . the riders flew off in mid-air because there was no way to keep the board with you---and as a result you hurt your feet, your legs, and the board. 7 Then I remembered the "Chip," a small experimental board we had built with footstraps, and thought "it's dumb not to use this for jumping." That's when I first started jumping with footstraps and discovering controlled flight. I could go so much faster than I ever thought and when you hit a wave it was like a motorcycle rider hitting a ramp; you just flew into the air. All of a sudden not only could you fly into the air, but you could land the thing, and not only that, but you could change direction in the air! 8 The whole sport of high-performance windsurfing really started from that. As soon as I did it, there were about ten of us who sailed all the time together and within one or two days there were various boards out there that had footstraps of various kinds on them, and we were all going fast and jumping waves and stuff. It just kind of snowballed from there. (Shah 2000) 9 By 1998, more than a million people were engaged in windsurfing, and a large fraction of the boards sold incorporated the user-developed innovations for the high-performance sport. 10 The user-centered innovation process just illustrated is in sharp contrast to the traditional model, in which products and services are developed by manufacturers in a closed way, the manufacturers using patents, copyrights, and other protections to prevent imitators from free riding on their innovation investments. In this traditional model, a user's only role is to have needs, which manufacturers then identify and fill by designing and producing new products. The manufacturer-centric model does fit some fields and conditions. However, a growing body of empirical work shows that users are the first to develop many and perhaps most new industrial and consumer products. Further, the contribution of users is growing steadily larger as a result of continuing advances in computer and communications capabilities. 11 In this book I explain in detail how the emerging process of user-centric, democratized innovation works. I also explain how innovation by users provides a very necessary complement to and feedstock for manufacturer innovation. 12 The ongoing shift of innovation to users has some very attractive qualities. It is becoming progressively easier for many users to get precisely what they want by designing it for themselves. And innovation by users appears to increase social welfare. At the same time, the ongoing shift of product-development activities from manufacturers to users is painful and difficult for many manufacturers. Open, distributed innovation is "attacking" a major structure of the social division of labor. Many firms and industries must make fundamental changes to long-held business models in order to adapt. Further, governmental policy and legislation sometimes preferentially supports innovation by manufacturers. Considerations of social welfare suggest that this must change. The workings of the intellectual property system are of special concern. But despite the difficulties, a democratized and user-centric system of innovation appears well worth striving for. 13 Users, as the term will be used in this book, are firms or individual consumers that expect to benefit from using a product or a service. In contrast, manufacturers expect to benefit from selling a product or a service. A firm or an individual can have different relationships to different products or innovations. For example, Boeing is a manufacturer of airplanes, but it is also a user of machine tools. If we were examining innovations developed by Boeing for the airplanes it sells, we would consider Boeing a manufacturer-innovator in those cases. But if we were considering innovations in metal-forming machinery developed by Boeing for in-house use in building airplanes, we would categorize those as user-developed innovations and would categorize Boeing as a user-innovator in those cases. 14 Innovation user and innovation manufacturer are the two general "functional" relationships between innovator and innovation. Users are unique in that they alone benefit directly from innovations. All others (here lumped under the term "manufacturers") must sell innovation-related products or services to users, indirectly or directly, in order to profit from innovations. Thus, in order to profit, inventors must sell or license knowledge related to innovations, and manufacturers must sell products or services incorporating innovations. Similarly, suppliers of innovation-related materials or services---unless they have direct use for the innovations---must sell the materials or services in order to profit from the innovations. 15 The user and manufacturer categorization of relationships between innovator and innovation can be extended to specific functions, attributes, or features of products and services. When this is done, it may turn out that different parties are associated with different attributes of a particular product or service. For example, householders are the users of the switching attribute of a household electric light switch---they use it to turn lights on and off. However, switches also have other attributes, such as "easy wiring" qualities, that may be used only by the electricians who install them. Therefore, if an electrician were to develop an improvement to the installation attributes of a switch, it would be considered a user-developed innovation. 16 A brief overview of the contents of the book follows. 17 Development of Products by Lead Users (Chapter 2) 18 Empirical studies show that many users---from 10 percent to nearly 40 percent---engage in developing or modifying products. About half of these studies do not determine representative innovation frequencies; they were designed for other purposes. Nonetheless, when taken together, the findings make it very clear that users are doing a lot of product modification and product development in many fields. 19 Studies of innovating users (both individuals and firms) show them to have the characteristics of "lead users." That is, they are ahead of the majority of users in their populations with respect to an important market trend, and they expect to gain relatively high benefits from a solution to the needs they have encountered there. The correlations found between innovation by users and lead user status are highly significant, and the effects are very large. 20 Since lead users are at the leading edge of the market with respect to important market trends, one can guess that many of the novel products they develop for their own use will appeal to other users too and so might provide the basis for products manufacturers would wish to commercialize. This turns out to be the case. A number of studies have shown that many of the innovations reported by lead users are judged to be commercially attractive and/or have actually been commercialized by manufacturers. 21 Research provides a firm grounding for these empirical findings. The two defining characteristics of lead users and the likelihood that they will develop new or modified products have been found to be highly correlated (Morrison et al. 2004). In addition, it has been found that the higher the intensity of lead user characteristics displayed by an innovator, the greater the commercial attractiveness of the innovation that the lead user develops (Franke and von Hippel 2003a). In figure 1.1, the increased concentration of innovations toward the right indicates that the likelihood of innovating is higher for users having higher lead user index values. The rise in average innovation attractiveness as one moves from left to right indicates that innovations developed by lead users tend to be more commercially attractive. (Innovation attractiveness is the sum of the novelty of the innovation and the expected future generality of market demand.) 22 [di_evh_f1-1.png] 23 Figure 1.1 User-innovators with stronger "lead user" characteristics develop innovations having higher appeal in the general marketplace. Estimated OLS function: Y = 2.06 + 0.57x, where Y represents attractiveness of innovation and x represents lead-user-ness of respondent. Adjusted R2 = 0.281; p = 0.002; n = 30. Source of data: Franke and von Hippel 2003. 24 Why Many Users Want Custom Products (Chapter 3) 25 Why do so many users develop or modify products for their own use? Users may innovate if and as they want something that is not available on the market and are able and willing to pay for its development. It is likely that many users do not find what they want on the market. Meta-analysis of market-segmentation studies suggests that users' needs for products are highly heterogeneous in many fields (Franke and Reisinger 2003). 26 Mass manufacturers tend to follow a strategy of developing products that are designed to meet the needs of a large market segment well enough to induce purchase from and capture significant profits from a large number of customers. When users' needs are heterogeneous, this strategy of "a few sizes fit all" will leave many users somewhat dissatisfied with the commercial products on offer and probably will leave some users seriously dissatisfied. In a study of a sample of users of the security features of Apache web server software, Franke and von Hippel (2003b) found that users had a very high heterogeneity of need, and that many had a high willingness to pay to get precisely what they wanted. Nineteen percent of the users sampled actually innovated to tailor Apache more closely to their needs. Those who did were found to be significantly more satisfied. 27 Users' Innovate-or-Buy Decisions (Chapter 4) 28 Even if many users want "exactly right products" and are willing and able to pay for their development, why do users often do this for themselves rather than hire a custom manufacturer to develop a special just-right product for them? After all, custom manufacturers specialize in developing products for one or a few users. Since these firms are specialists, it is possible that they could design and build custom products for individual users or user firms faster, better, or cheaper than users could do this for themselves. Despite this possibility, several factors can drive users to innovate rather than buy. Both in the case of user firms and in the case of individual user-innovators, agency costs play a major role. In the case of individual user-innovators, enjoyment of the innovation process can also be important. 29 With respect to agency costs, consider that when a user develops its own custom product that user can be trusted to act in its own best interests. When a user hires a manufacturer to develop a custom product, the situation is more complex. The user is then a principal that has hired the custom manufacturer to act as its agent. If the interests of the principal and the agent are not the same, there will be agency costs. In general terms, agency costs are (1) costs incurred to monitor the agent to ensure that it (or he or she) follows the interests of the principal, (2) the cost incurred by the agent to commit itself not to act against the principal's interest (the "bonding cost"), and (3) costs associated with an outcome that does not fully serve the interests of the principal (Jensen and Meckling 1976). In the specific instance of product and service development, a major divergence of interests between user and custom manufacturer does exist: the user wants to get precisely what it needs, to the extent that it can afford to do so. In contrast, the custom manufacturer wants to lower its development costs by incorporating solution elements it already has or that it predicts others will want in the future---even if by doing so it does not serve its present client's needs as well as it could. 30 A user wants to preserve its need specification because that specification is chosen to make that user's overall solution quality as high as possible at the desired price. For example, an individual user may specify a mountain-climbing boot that will precisely fit his unique climbing technique and allow him to climb Everest more easily. Any deviations in boot design will require compensating modifications in the climber's carefully practiced and deeply ingrained climbing technique---a much more costly solution from the user's point of view. A custom boot manufacturer, in contrast, will have a strong incentive to incorporate the materials and processes it has in stock and expects to use in future even if this produces a boot that is not precisely right for the present customer. For example, the manufacturer will not want to learn a new way to bond boot components together even if that would produce the best custom result for one client. The net result is that when one or a few users want something special they will often get the best result by innovating for themselves. 31 A small model of the innovate-or-buy decision follows. This model shows in a quantitative way that user firms with unique needs will always be better off developing new products for themselves. It also shows that development by manufacturers can be the most economical option when n or more user firms want the same thing. However, when the number of user firms wanting the same thing falls between 1 and n, manufacturers may not find it profitable to develop a new product for just a few users. In that case, more than one user may invest in developing the same thing independently, owing to market failure. This results in a waste of resources from the point of view of social welfare. The problem can be addressed by new institutional forms, such as the user innovation communities that will be studied later in this book. 32 Chapter 4 concludes by pointing out that an additional incentive can drive individual user-innovators to innovate rather than buy: they may value the process of innovating because of the enjoyment or learning that it brings them. It might seem strange that user-innovators can enjoy product development enough to want to do it themselves---after all, manufacturers pay their product developers to do such work! On the other hand, it is also clear that enjoyment of problem solving is a motivator for many individual problem solvers in at least some fields. Consider for example the millions of crossword-puzzle aficionados. Clearly, for these individuals enjoyment of the problem-solving process rather than the solution is the goal. One can easily test this by attempting to offer a puzzle solver a completed puzzle---the very output he or she is working so hard to create. One will very likely be rejected with the rebuke that one should not spoil the fun! Pleasure as a motivator can apply to the development of commercially useful innovations as well. Studies of the motivations of volunteer contributors of code to widely used software products have shown that these individuals too are often strongly motivated to innovate by the joy and learning they find in this work (Hertel et al. 2003; Lakhani and Wolf 2005). 33 Users' Low-Cost Innovation Niches (Chapter 5) 34 An exploration of the basic processes of product and service development show that users and manufacturers tend to develop different types of innovations. This is due in part to information asymmetries: users and manufacturers tend to know different things. Product developers need two types of information in order to succeed at their work: need and context-of-use information (generated by users) and generic solution information (often initially generated by manufacturers specializing in a particular type of solution). Bringing these two types of information together is not easy. Both need information and solution information are often very "sticky"---that is, costly to move from the site where the information was generated to other sites. As a result, users generally have a more accurate and more detailed model of their needs than manufacturers have, while manufacturers have a better model of the solution approach in which they specialize than the user has. 35 When information is sticky, innovators tend to rely largely on information they already have in stock. One consequence of the information asymmetry between users and manufacturers is that users tend to develop innovations that are functionally novel, requiring a great deal of user-need information and use-context information for their development. In contrast, manufacturers tend to develop innovations that are improvements on well-known needs and that require a rich understanding of solution information for their development. For example, firms that use inventory-management systems, such as retailers, tend to be the developers of new approaches to inventory management. In contrast, manufacturers of inventory-management systems and equipment tend to develop improvements to the equipment used to implement these user-devised approaches (Ogawa 1998). 36 If we extend the information-asymmetry argument one step further, we see that information stickiness implies that information on hand will also differ among individual users and manufacturers. The information assets of some particular user (or some particular manufacturer) will be closest to what is required to develop a particular innovation, and so the cost of developing that innovation will be relatively low for that user or manufacturer. The net result is that user innovation activities will be distributed across many users according to their information endowments. With respect to innovation, one user is by no means a perfect substitute for another. 37 Why Users Often Freely Reveal Their Innovations (Chapter 6) 38 The social efficiency of a system in which individual innovations are developed by individual users is increased if users somehow diffuse what they have developed to others. Manufacturer-innovators partially achieve this when they sell a product or a service on the open market (partially because they diffuse the product incorporating the innovation, but often not all the information that others would need to fully understand and replicate it). If user-innovators do not somehow also diffuse what they have done, multiple users with very similar needs will have to independently develop very similar innovations---a poor use of resources from the viewpoint of social welfare. Empirical research shows that users often do achieve widespread diffusion by an unexpected means: they often "freely reveal" what they have developed. When we say that an innovator freely reveals information about a product or service it has developed, we mean that all intellectual property rights to that information are voluntarily given up by the innovator, and all interested parties are given access to it---the information becomes a public good. 39 The empirical finding that users often freely reveal their innovations has been a major surprise to innovation researchers. On the face of it, if a user-innovator's proprietary information has value to others, one would think that the user would strive to prevent free diffusion rather than help others to free ride on what it has developed at private cost. Nonetheless, it is now very clear that individual users and user firms---and sometimes manufacturers---often freely reveal detailed information about their innovations. 40 The practices visible in "open source" software development were important in bringing this phenomenon to general awareness. In these projects it was clear policy that project contributors would routinely and systematically freely reveal code they had developed at private expense (Raymond 1999). However, free revealing of product innovations has a history that began long before the advent of open source software. Allen, in his 1983 study of the eighteenth-century iron industry, was probably the first to consider the phenomon systematically. Later, Nuvolari (2004) discussed free revealing in the early history of mine pumping engines. Contemporary free revealing by users has been documented by von Hippel and Finkelstein (1979) for medical equipment, by Lim (2000) for semiconductor process equipment, by Morrison, Roberts, and von Hippel (2000) for library information systems, and by Franke and Shah (2003) for sporting equipment. Henkel (2003) has documented free revealing among manufacturers in the case of embedded Linux software. 41 Innovators often freely reveal because it is often the best or the only practical option available to them. Hiding an innovation as a trade secret is unlikely to be successful for long: too many generally know similar things, and some holders of the "secret" information stand to lose little or nothing by freely revealing what they know. Studies find that innovators in many fields view patents as having only limited value. Copyright protection and copyright licensing are applicable only to "writings," such as books, graphic images, and computer software. 42 Active efforts by innovators to freely reveal---as opposed to sullen acceptance---are explicable because free revealing can provide innovators with significant private benefits as well as losses or risks of loss. Users who freely reveal what they have done often find that others then improve or suggest improvements to the innovation, to mutual benefit (Raymond 1999). Freely revealing users also may benefit from enhancement of reputation, from positive network effects due to increased diffusion of their innovation, and from other factors. Being the first to freely reveal a particular innovation can also enhance the benefits received, and so there can actually be a rush to reveal, much as scientists rush to publish in order to gain the benefits associated with being the first to have made a particular advancement. 43 Innovation Communities (Chapter 7) 44 Innovation by users tends to be widely distributed rather than concentrated among just a very few very innovative users. As a result, it is important for user-innovators to find ways to combine and leverage their efforts. Users achieve this by engaging in many forms of cooperation. Direct, informal user-to-user cooperation (assisting others to innovate, answering questions, and so on) is common. Organized cooperation is also common, with users joining together in networks and communities that provide useful structures and tools for their interactions and for the distribution of innovations. Innovation communities can increase the speed and effectiveness with which users and also manufacturers can develop and test and diffuse their innovations. They also can greatly increase the ease with which innovators can build larger systems from interlinkable modules created by community participants. 45 Free and open source software projects are a relatively well-developed and very successful form of Internet-based innovation community. However, innovation communities are by no means restricted to software or even to information products, and they can play a major role in the development of physical products. Franke and Shah (2003) have documented the value that user innovation communities can provide to user-innovators developing physical products in the field of sporting equipment. The analogy to open source innovation communities is clear. 46 The collective or community effort to provide a public good---which is what freely revealed innovations are---has traditionally been explored in the literature on "collective action." However, behaviors seen in extant innovation communities fail to correspond to that literature at major points. In essence, innovation communities appear to be more robust with respect to recruiting and rewarding members than the literature would predict. Georg von Krogh and I attribute this to innovation contributors' obtaining some private rewards that are not shared equally by free riders (those who take without contributing). For example, a product that a user-innovator develops and freely reveals might be perfectly suited to that user-innovator's requirements but less well suited to the requirements of free riders. Innovation communities thus illustrate a "private-collective" model of innovation incentive (von Hippel and von Krogh 2003). 47 Adapting Policy to User Innovation (Chapter 8) 48 Is innovation by users a "good thing?" Welfare economists answer such a question by studying how a phenomenon or a change affects social welfare. Henkel and von Hippel (2005) explored the social welfare implications of user innovation. They found that, relative to a world in which only manufacturers innovate, social welfare is very probably increased by the presence of innovations freely revealed by users. This finding implies that policy making should support user innovation, or at least should ensure that legislation and regulations do not favor manufacturers at the expense of user-innovators. 49 The transitions required of policy making to achieve neutrality with respect to user innovation vs. manufacturer innovation are significant. Consider the impact on open and distributed innovation of past and current policy decisions. Research done in the past 30 years has convinced many academics that intellectual property law is sometimes or often not having its intended effect. Intellectual property law was intended to increase the amount of innovation investment. Instead, it now appears that there are economies of scope in both patenting and copyright that allow firms to use these forms of intellectual property law in ways that are directly opposed to the intent of policy makers and to the public welfare. Major firms can invest to develop large portfolios of patents. They can then use these to create "patent thickets"---dense networks of patent claims that give them plausible grounds for threatening to sue across a wide range of intellectual property. They may do this to prevent others from introducing a superior innovation and/or to demand licenses from weaker competitors on favorable terms (Shapiro 2001). Movie, publishing, and software firms can use large collections of copyrighted work to a similar purpose (Benkler 2002). In view of the distributed nature of innovation by users, with each tending to create a relatively small amount of intellectual property, users are likely to be disadvantaged by such strategies. 50 It is also important to note that users (and manufacturers) tend to build prototypes of their innovations economically by modifying products already available on the market to serve a new purpose. Laws such as the (US) Digital Millennium Copyright Act, intended to prevent consumers from illegally copying protected works, also can have the unintended side effect of preventing users from modifying products that they purchase (Varian 2002). Both fairness and social welfare considerations suggest that innovation-related policies should be made neutral with respect to the sources of innovation. 51 It may be that current impediments to user innovation will be solved by legislation or by policy making. However, beneficiaries of existing law and policy will predictably resist change. Fortunately, a way to get around some of these problems is in the hands of innovators themselves. Suppose many innovators in a particular field decide to freely reveal what they have developed, as they often have reason to do. In that case, users can collectively create an information commons (a collection of information freely available to all) containing substitutes for some or a great deal of information now held as private intellectual property. Then user-innovators can work around the strictures of intellectual property law by simply using these freely revealed substitutes (Lessig 2001). This is essentially what is happening in the field of software. For many problems, user-innovators in that field now have a choice between proprietary, closed software provided by Microsoft and other firms and open source software that they can legally download from the Internet and legally modify to serve their own specific needs. 52 Policy making that levels the playing field between users and manufacturers will force more rapid change onto manufacturers but will by no means destroy them. Experience in fields where open and distributed innovation processes are far advanced show how manufacturers can and do adapt. Some, for example, learn to supply proprietary platform products that offer user-innovators a framework upon which to develop and use their improvements. 53 Democratizing Innovation (Chapter 9) 54 Users' ability to innovate is improving radically and rapidly as a result of the steadily improving quality of computer software and hardware, improved access to easy-to-use tools and components for innovation, and access to a steadily richer innovation commons. Today, user firms and even individual hobbyists have access to sophisticated programming tools for software and sophisticated CAD design tools for hardware and electronics. These information-based tools can be run on a personal computer, and they are rapidly coming down in price. As a consequence, innovation by users will continue to grow even if the degree of heterogeneity of need and willingness to invest in obtaining a precisely right product remains constant. 55 Equivalents of the innovation resources described above have long been available within corporations to a few. Senior designers at firms have long been supplied with engineers and designers under their direct control, and with the resources needed to quickly construct and test prototype designs. The same is true in other fields, including automotive design and clothing design: just think of the staffs of engineers and modelmakers supplied so that top auto designers can quickly realize and test their designs. 56 But if, as we have seen, the information needed to innovate in important ways is widely distributed, the traditional pattern of concentrating innovation-support resources on a few individuals is hugely inefficient. High-cost resources for innovation support cannot efficiently be allocated to "the right people with the right information:" it is very difficult to know who these people may be before they develop an innovation that turns out to have general value. When the cost of high-quality resources for design and prototyping becomes very low (the trend we have described), these resources can be diffused very widely, and the allocation problem diminishes in significance. The net result is and will be to democratize the opportunity to create. 57 On a level playing field, users will be an increasingly important source of innovation and will increasingly substitute for or complement manufacturers' innovation-related activities. In the case of information products, users have the possibility of largely or completely doing without the services of manufacturers. Open source software projects are object lessons that teach us that users can create, produce, diffuse, provide user field support for, update, and use complex products by and for themselves in the context of user innovation communities. In physical product fields, product development by users can evolve to the point of largely or totally supplanting product development---but not product manufacturing---by manufacturers. (The economies of scale associated with manufacturing and distributing physical products give manufacturers an advantage over "do-it-yourself" users in those activities.) 58 The evolving pattern of the locus of product development in kitesurfing illustrates how users can displace manufacturers from the role of product developer. In that industry, the collective product-design and testing work of a user innovation community has clearly become superior in both quality and quantity relative to the levels of in-house development effort that manufacturers of kitesurfing equipment can justify. Accordingly, manufacturers of such equipment are increasingly shifting away from product design and focusing on producing product designs first developed and tested by user innovation communities. 59 How can or should manufacturers adapt to users' encroachment on elements of their traditional business activities? There are three general possibilities: (1) Produce user-developed innovations for general commercial sale and/or offer custom manufacturing to specific users. (2) Sell kits of product-design tools and/or "product platforms" to ease users' innovation-related tasks. (3) Sell products or services that are complementary to user-developed innovations. Firms in fields where users are already very active in product design are experimenting with all these possibilities. 60 Application: Searching for Lead User Innovations (Chapter 10) 61 Manufacturers design their innovation processes around the way they think the process works. The vast majority of manufacturers still think that product development and service development are always done by manufacturers, and that their job is always to find a need and fill it rather than to sometimes find and commercialize an innovation that lead users have already developed. Accordingly, manufacturers have set up market-research departments to explore the needs of users in the target market, product-development groups to think up suitable products to address those needs, and so forth. The needs and prototype solutions of lead users---if encountered at all---are typically rejected as outliers of no interest. Indeed, when lead users' innovations do enter a firm's product line---and they have been shown to be the actual source of many major innovations for many firms--- they typically arrive with a lag and by an unconventional and unsystematic route. For example, a manufacturer may "discover" a lead user innovation only when the innovating user firm contacts the manufacturer with a proposal to produce its design in volume to supply its own in-house needs. Or sales or service people employed by a manufacturer may spot a promising prototype during a visit to a customer's site. 62 Modification of firms' innovation processes to systematically search for and further develop innovations created by lead users can provide manufacturers with a better interface to the innovation process as it actually works, and so provide better performance. A natural experiment conducted at 3M illustrates this possibility. Annual sales of lead user product ideas generated by the average lead user project at 3M were conservatively forecast by management to be more than 8 times the sales forecast for new products developed in the traditional manner---$146 million versus $18 million per year. In addition, lead user projects were found to generate ideas for new product lines, while traditional market-research methods were found to produce ideas for incremental improvements to existing product lines. As a consequence, 3M divisions funding lead user project ideas experienced their highest rate of major product line generation in the past 50 years (Lilien et al. 2002). 63 Application: Toolkits for User Innovation and Custom Design (Chapter 11) 64 Firms that understand the distributed innovation process and users' roles in it can change factors affecting lead user innovation and so affect its rate and direction in ways they value. Toolkits for user innovation custom design offer one way of doing this. This approach involves partitioning product-development and service-development projects into solution-information-intensive subtasks and need-information-intensive subtasks. Need-intensive subtasks are then assigned to users along with a kit of tools that enable them to effectively execute the tasks assigned to them. The resulting co-location of sticky information and problem-solving activity makes innovation within the solution space offered by a particular toolkit cheaper for users. It accordingly attracts them to the toolkit and so influences what they develop and how they develop it. The custom semiconductor industry was an early adopter of toolkits. In 2003, more than $15 billion worth of semiconductors were produced that had been designed using this approach. 65 Manufacturers that adopt the toolkit approach to supporting and channeling user innovation typically face major changes in their business models, and important changes in industry structure may also follow. For example, as a result of the introduction of toolkits to the field of semiconductor manufacture, custom semiconductor manufacturers---formerly providers of both design and manufacturing services to customers---lost much of the work of custom product design to customers. Many of these manufacturers then became specialist silicon foundries, supplying production services primarily. Manufacturers may or may not wish to make such changes. However, experience in fields where toolkits have been deployed shows that customers tend to prefer designing their own custom products with the aid of a toolkit over traditional manufacturer-centric development practices. As a consequence, the only real choice for manufacturers in a field appropriate to the deployment of toolkits may be whether to lead or to follow in the transition to toolkits. 66 Linking User Innovation to Other Phenomena and Fields (Chapter 12) 67 In chapter 12 I discuss links between user innovation and some related phenomena and literatures. With respect to phenomena, I point out the relationship of user innovation to information communities, of which user innovation communities are a subset. One open information community is the online encyclopedia Wikipedia (www.wikipedia.org). Other such communities include the many specialized Internet sites where individuals with both common and rare medical conditions can find one another and can find specialists in those conditions. Many of the advantages associated with user innovation communities also apply to open information networks and communities. Analyses appropriate to information communities follow the same overall pattern as the analyses provided in this book for innovation communities. However, they are also simpler, because in open information communities there may be little or no proprietary information being transacted and thus little or no risk of related losses for participants. 68 Next I discuss links between user-centric innovation phenomena and the literature on the economics of knowledge that have been forged by Foray (2004) and Weber (2004). I also discuss how Porter's 1991 work on the competitive advantage of nations can be extended to incorporate findings on nations' lead users as product developers. Finally, I point out how findings explained in this book link to and complement research on the Social Construction of Technology (Pinch and Bijker 1987). 69 I conclude this introductory chapter by reemphasizing that user innovation, free revealing, and user innovation communities will flourish under many but not all conditions. What we know about manufacturer-centered innovation is still valid; however, lead-user-centered innovation patterns are increasingly important, and they present major new opportunities and challenges for us all. 70 2 Development of Products by Lead Users 71 The idea that novel products and services are developed by manufacturers is deeply ingrained in both traditional expectations and scholarship. When we as users of products complain about the shortcomings of an existing product or wish for a new one, we commonly think that "they" should develop it---not us. Even the conventional term for an individual end user, "consumer," implicitly suggests that users are not active in product and service development. Nonetheless, there is now very strong empirical evidence that product development and modification by both user firms and users as individual consumers is frequent, pervasive, and important. 72 I begin this chapter by reviewing the evidence that many users indeed do develop and modify products for their own use in many fields. I then show that innovation is concentrated among lead users, and that lead users' innovations often become commercial products. 73 Many Users Innovate 74 The evidence on user innovation frequency and pervasiveness is summarized in table 2.1. We see here that the frequency with which user firms and individual consumers develop or modify products for their own use range from 10 percent to nearly 40 percent in fields studied to date. The matter has been studied across a wide range of industrial product types where innovating users are user firms, and also in various types of sporting equipment, where innovating users are individual consumers. 75 The studies cited in table 2.1 clearly show that a lot of product development and modification by users is going on. However, these findings should not be taken to reflect innovation rates in overall populations of users. All of the studies probably were affected by a response bias. (That is, if someone sends a questionnaire about whether you innovated or not, you might be more inclined to respond if your answer is "Yes."). Also, each of the studies looked at innovation rates affecting a particular product type among users who care a great deal about that product type. Thus, university surgeons (study 4 in table 2.1) care a great deal about having just-right surgical equipment, just as serious mountain bikers (study 8) care a great deal about having just-right equipment for their sport. As the intensity of interest goes down, it is likely that rates of user innovation drop too. This is probably what is going on in the case of the study of purchasers of outdoor consumer products (study 6). All we are told about that sample of users of outdoor consumer products is that they are recipients of one or more mail order catalogs from suppliers of relatively general outdoor items---winter jackets, sleeping bags, and so on. Despite the fact that these users were asked if they have developed or modified any item in this broad category of goods (rather than a very specific one such as a mountain bike), just 10 percent answered in the affirmative. Of course, 10 percent or even 5 percent of a user population numbering in the tens of millions worldwide is still a very large number---so we again realize that many users are developing and modifying products. 76 Table 2.1 Many respondents reported developing or modifying products for their own use in the eight product areas listed here. 77
Number and type of Users SampledPercentage developing and building product for own useSource
Industrial products
1. Printed circuit CAD software136 user firm attendees at PC-CAD conference24.3%Urban and von Hippel 1988
2. Pipe hanger hardwareEmployees in 74 pipe hanger installation firms36%Herstatt and von Hippel 1992
3. Library information systemsEmployees in 102 Australian libraries using computerized OPAC library information systems26%Morrison et al. 2000
4. Surgical equipment261 surgeons working in university clinics in Germany22%Lýthje 2003
5. Apache OS server software security features131 technically sophisticated Apache features users (webmasters)19.1%Franke and von Hippel 2003
Consumer products
6. Outdoor consumer products153 recipients of mail order catalogs for outdoor activity products for consumers9.8%Lýthje 2004
7. "Extreme" sporting equipment197 members of 4 specialized sporting clubs in 4 "extreme" sports37.8%Franke and Shah 2003
8. Mountain biking equipment291 mountain bikers in a geographic region19.2%Lýthje et al.
 78 The cited studies also do not set an upper or a lower bound on the commercial or technical importance of user-developed products and product modifications that they report, and it is likely that most are of minor significance. However, most innovations from any source are minor, so user-innovators are no exception in this regard. Further, to say an innovation is minor is not the same as saying it is trivial: minor innovations are cumulatively responsible for much or most technical progress. Hollander (1965) found that about 80 percent of unit cost reductions in Rayon manufacture were the cumulative result of minor technical changes. Knight (1963, VII, pp. 2--3) measured performance advances in general-purpose digital computers and found, similarly, that "these advances occur as the result of equipment designers using their knowledge of electronics technology to produce a multitude of small improvements that together produce significant performance advances." 79 Although most products and product modifications that users or others develop will be minor, users are by no means restricted to developing minor or incremental innovations. Qualitative observations have long indicated that important process improvements are developed by users. Smith (1776, pp. 11--13) pointed out the importance of "the invention of a great number of machines which facilitate and abridge labor, and enable one man to do the work of many." He also noted that "a great part of the machines made use of in those manufactures in which labor is most subdivided, were originally the invention of common workmen, who, being each of them employed in some very simple operation, naturally turned their thoughts towards finding out easier and readier methods of performing it." Rosenberg (1976) studied the history of the US machine tool industry and found that important and basic machine types like lathes and milling machines were first developed and built by user firms having a strong need for them. Textile manufacturing firms, gun manufacturers and sewing machine manufacturers were important early user-developers of machine tools. Other studies show quantitatively that some of the most important and novel products and processes have been developed by user firms and by individual users. Enos (1962) reported that nearly all the most important innovations in oil refining were developed by user firms. Freeman (1968) found that the most widely licensed chemical production processes were developed by user firms. Von Hippel (1988) found that users were the developers of about 80 percent of the most important scientific instrument innovations, and also the developers of most of the major innovations in semiconductor processing. Pavitt (1984) found that a considerable fraction of invention by British firms was for in-house use. Shah (2000) found that the most commercially important equipment innovations in four sporting fields tended to be developed by individual users. 80 Lead User Theory 81 A second major finding of empirical research into innovation by users is that most user-developed products and product modifications (and the most commercially attractive ones) are developed by users with "lead user" characteristics. Recall from chapter 1 that lead users are defined as members of a user population having two distinguishing characteristics: (1) They are at the leading edge of an important market trend(s), and so are currently experiencing needs that will later be experienced by many users in that market. (2) They anticipate relatively high benefits from obtaining a solution to their needs, and so may innovate. 82 The theory that led to defining "lead users" in terms of these two characteristics was derived as follows (von Hippel 1986). First, the "ahead on an important market trend" variable was included because of its assumed effect on the commercial attractiveness of innovations developed by users residing at a leading-edge position in a market. Market needs are not static---they evolve, and often they are driven by important underlying trends. If people are distributed with respect to such trends as diffusion theory indicates, then people at the leading edges of important trends will be experiencing needs today (or this year) that the bulk of the market will experience tomorrow (or next year). And, if users develop and modify products to satisfy their own needs, then the innovations that lead users develop should later be attractive to many. The expected benefits variable and its link to innovation likelihood was derived from studies of industrial product and process innovations. These showed that the greater the benefit an entity expects to obtain from a needed innovation, the greater will be that entity's investment in obtaining a solution, where a solution is an innovation either developed or purchased (Schmookler 1966; Mansfield 1968). 83 Empirical studies to date have confirmed lead user theory. Morrison, Roberts, and Midgely (2004) studied the characteristics of innovating and non-innovating users of computerized library information systems in a sample of Australian libraries. They found that the two lead user characteristics were distributed in a continuous, unimodal manner in that sample. They also found that the two characteristics of lead users and the actual development of innovations by users were highly correlated. Franke and von Hippel (2003b) confirmed these findings in a study of innovating and non-innovating users of Apache web server software. They also found that the commercial attractiveness of innovations developed by users increased along with the strength of those users' lead user characteristics. 84 Evidence of Innovation by Lead Users 85 Several studies have found that user innovation is largely the province of users that have lead user characteristics, and that products lead users develop often form the basis for commercial products. These general findings appear robust: the studies have used a variety of techniques and have addressed a variety of markets and innovator types. Brief reviews of four studies will convey the essence of what has been found. 86 Innovation in Industrial Product User Firms 87 In the first empirical study of lead users' role in innovation, Urban and von Hippel (1988) studied user innovation activity related to a type of software used to design printed circuit boards. A major market trend to which printed circuit computer-aided design software (PC-CAD) must respond is the steady movement toward packing electronic circuitry more densely onto circuit boards. Higher density means one that can shrink boards in overall size and that enables the circuits they contain to operate faster---both strongly desired attributes. Designing a board at the leading edge of what is technically attainable in density at any particular time is a very demanding task. It involves some combination of learning to make the printed circuit wires narrower, learning how to add more layers of circuitry to a board, and using smaller electronic components. 88 To explore the link between user innovation and needs at the leading edge of the density trend, Urban and von Hippel collected a sample of 138 user-firm employees who had attended a trade show on the topic of PC-CAD. To learn the position of each firm on the density trend, they asked questions about the density of the boards that each PC-CAD user firm was currently producing. To learn about each user's likely expected benefits from improvements to PC-CAD, they asked questions about how satisfied each respondent was with their firm's present PC-CAD capabilities. To learn about users' innovation activities, they asked questions about whether each firm had modified or built its own PC-CAD software for its own in-house use. 89 Users' responses were cluster analyzed, and clear lead user (n = 38) and non-lead-user (n = 98) clusters were found. Users in the lead user cluster were those that made the densest boards on average and that also were dissatisfied with their PC-CAD capabilities. In other words, they were at the leading edge of an important market trend, and they had a high incentive to innovate to improve their capabilities. Strikingly, 87 percent of users in the lead user cluster reported either developing or modifying the PC-CAD software that they used. In contrast, only 1 percent of non-lead users reported this type of innovation. Clearly, in this case user innovation was very strongly concentrated in the lead user segment of the user population. A discriminant analysis on indicated that "build own system" was the most important indicator of membership in the lead user cluster. The discriminant analysis had 95.6 percent correct classification of cluster membership. 90 The commercial attractiveness of PC-CAD solutions developed by lead users was high. This was tested by determining whether lead users and more ordinary users preferred a new PC-CAD system concept containing features developed by lead users over the best commercial PC-CAD system available at the time of the study (as determined by a large PC-CAD system manufacturer's competitive analysis) and two additional concepts. The concept containing lead user features was significantly preferred at even twice the price (p < 0.01). 91 Innovation in Libraries 92 Morrison, Roberts, and von Hippel (2000) explored user modifications made by Australian libraries to computerized information search systems called Online Public Access systems ("OPACs"). Libraries might not seem the most likely spot for technological innovators to lurk. However, computer technologies and the Internet have had a major effect on how libraries are run, and many libraries now have in-house programming expertise. Computerized search methods for libraries were initially developed by advanced and technically sophisticated user institutions. Development began in the United States in the 1970s with work by major universities and the Library of Congress, with support provided by grants from the federal government (Tedd 1994). Until roughly 1978, the only such systems extant were those that had been developed by libraries for their own use. In the late 1970s, the first commercial providers of computerized search systems for libraries appeared in the United States, and by 1985 there were at least 48 OPAC vendors in the United States alone (Matthews 1985). In Australia (site of the study sample), OPAC adoption began about 8 years later than in the United States (Tedd 1994). 93 Morrison, Roberts, and I obtained responses from 102 Australian libraries that were users of OPACs. We found that 26 percent of these had in fact modified their OPAC hardware or software far beyond the user-adjustment capabilities provided by the system manufacturers. The types of innovations that the libraries developed varied widely according to local needs. For example, the library that modified its OPAC to "add book retrieval instructions for staff and patrons" (table 2.2) did so because its collection of books was distributed in a complex way across a number of buildings--- making it difficult for staff and patrons to find books without precise directions. There was little duplication of innovations except in the case of adding Internet search capabilities to OPACs. In that unusual case, nine libraries went ahead and did the programming needed to add this important feature in advance of its being offered by the manufacturers of their systems. 94 Table 2.2 OPAC modifications created by users served a wide variety of functions. 95
Improved library managementImproved information-search capabilities
Add library patron summary statisticsIntegrate images in records (2)
Add library identifiersCombined menu/command searches
Add location records for physical auditAdd title sorting and short title listing
Add book retrieval instructions for staff and patronsAdd fast access key commands
Add CD ROM System backupAdd multilingual search formats < :br>Add key word searches (2)
Add book access control based on copyrightAdd topic linking and subject access
Patrons can check their status via OPACAdd prior search recall feature
Patrons can reserve books via OPAC (2)Add search "navigation aids"
Remote access to OPAC by different systemsAdd different hierarchical searches
Add graduated system access via passwordAccess to other libraries' catalogs (2)
Add interfaces to other in-house IT systemsAdd or customize web interface (9)
Word processing and correspondence (2) Hot links for topics
Umbrella for local information collection (2) Extended searches
Local systems adaptation Hot links for source material
 96 Source of data: Morrison et al. 2000, table 1. Number of users (if more than one) developing functionally similar innovations is shown in parentheses after description of innovation. 97 The libraries in the sample were asked to rank themselves on a number of characteristics, including "leading edge status" (LES). (Leading edge status, a construct developed by Morrison, is related to and highly correlated with the lead user construct (in this sample, ρ (LES, CLU) = 0.904, p = 0.000). 1 Self-evaluation bias was checked for by asking respondents to name other libraries they regarded as having the characteristics of lead users. Self-evaluations and evaluations by others did not differ significantly. 1 LES contains four types of measures. Three ("benefits recognized early," "high benefits expected," and "direct elicitation of the construct") contain the core components of the lead user construct. The fourth ("applications generation") is a measure of a number of innovation-related activities in which users might engage: they "suggest new applications," they "pioneer those applications," and (because they have needs or problems earlier than their peers) they may be "used as a test site" (Morrison, Midgely, and Roberts 2004). 98 Libraries that had modified their OPAC systems were found to have significantly higher LES---that is, to be lead users. They were also found to have significantly higher incentives to make modifications than non-innovators, better in-house technical skills, and fewer "external resources" (for example, they found it difficult to find outside vendors to develop the modifications they wanted for them). Application of these four variables in a logit model classified libraries into innovator and non-innovator categories with an accuracy of 88 percent (table 2.3). 99 Table 2.3 Factors associated with innovating in librararies (logit model). χ2/4 = 33.85; ρ2 = 0.40; classification rate = 87.78%. 100
CoefficientStandard error
Leading-edge status1.8620.601
Lack of incentive to modify--0.8450.436
Lack of in-house technology skills--1.0690.412
Lack of external resources0.6950.456
Constant--2.5930.556
 101 Source: Morrison et al. 2000, table 6. 102 The commercial value of user-developed innovations in the library OPAC sample was assessed in a relatively informal way. Two development mangers employed by the Australian branches of two large OPAC manufacturers were asked to evaluate the commercial value of each user innovation in the sample. They were asked two questions about each: (1) "How important commercially to your firm is the functionality added to OPACs by this user-developed modification?" (2) "How novel was the information contained in the user innovation to your firm at the time that innovation was developed?" Responses from both managers indicated that about 70 percent (25 out of 39) of the user modifications provided functionality improvements of at least "medium" commercial importance to OPACs---and in fact many of the functions were eventually incorporated in the OPACs the manufacturers sold. However, the managers also felt that their firms generally already knew about the lead users' needs when the users developed their solutions, and that the innovations the users developed provided novel information to their company only in 10--20 percent of the cases. (Even when manufacturers learn about lead users' needs early, they may not think it profitable to develop their own solution for an "emerging" need until years later. I will develop this point in chapter 4.) 103 "Consumer" Innovation in Sports Communities 104 Franke and Shah (2003) studied user innovation in four communities of sports enthusiasts. The communities, all located in Germany, were focused on four very different sports. 105 One community was devoted to canyoning, a new sport popular in the Alps. Canyoning combines mountain climbing, abseiling (rappelling), and swimming in canyons. Members do things like rappel down the middle of an active waterfall into a canyon below. Canyoning requires significant skill and involves physical risk. It is also a sport in rapid evolution as participants try new challenges and explore the edges of what is both achievable and fun. 106 The second community studied was devoted to sailplaning. Sailplaning or gliding, a more mature sport than canyoning, involves flying in a closed, engineless glider carrying one or two people. A powered plane tows the glider to a desired altitude by means of a rope; then the rope is dropped and the engineless glider flies on its own, using thermal updrafts in the atmosphere to gain altitude as possible. The sailplaning community studied by Franke and Shah consisted of students of technical universities in Germany who shared an interest in sailplaning and in building their own sailplanes. 107 Boardercross was the focus of the third community. In this sport, six snowboarders compete simultaneously in a downhill race. Racetracks vary, but each is likely to incorporate tunnels, steep curves, water holes, and jumps. The informal community studied consisted of semi-professional athletes from all over the world who met in as many as ten competitions a year in Europe, in North America, and in Japan. 108 The fourth community studied was a group of semi-professional cyclists with various significant handicaps, such as cerebral palsy or an amputated limb. Such individuals must often design or make improvements to their equipment to accommodate their particular disabilities. These athletes knew each other well from national and international competitions, training sessions, and seminars sponsored by the Deutscher Sportbund (German National Sports Council). 109 A total of 197 respondents (a response rate of 37.8 percent) answered a questionnaire about innovation activities in their communities. Thirty-two percent reported that they had developed or modified equipment they used for their sport. The rate of innovation varied among the sports, the high being 41 percent of the sailplane enthusiasts reporting innovating and the low being 18 percent of the boardercross snowboarders reporting. (The complexity of the equipment used in the various sports probably had something to do with this variation: a sailplane has many more components than a snowboard.) 110 The innovations developed varied a great deal. In the sailplane community, users developed innovations ranging from a rocket-assisted emergency ejection system to improvements in cockpit ventilation. Snowboarders invented such things as improved boots and bindings. Canyoners' inventions included very specialized solutions, such as a way to cut loose a trapped rope by using a chemical etchant. With respect to commercial potential, 111 Franke and Shah found that 23 percent of the user-developed innovations reported were or soon would be produced for sale by a manufacturer. Franke and Shah found that users who innovated were significantly higher on measures of the two lead user characteristics than users who did not innovate (table 2.4). They also found that the innovators spent more time in sporting and community-related activities and felt they had a more central role in the community. 112 Table 2.4 Factors associated with innovation in sports communities. 113
InnovatorsaNon-innovatorsbSignificance of differencec
Time in community
Years as a community member4.463.17p < 0.01
Days per year spent with community members43.0732.73p < 0.05
Days per year spent participating in the sport72.4868.71not significant
Role in communityd
"I am a very active member of the community."2.853.82p < 0.01
"I get together with members of the community for activities that are not related to the sport (movies, dinner parties, etc.)."3.394.14p < 0.05
"The community takes my opinion into account when making decisions"2.893.61p < 0.05
Lead user characteristic 1: being ahead of the trendd
"I usually find out about new products and solutions earlier than others."2.714.03p < 0.001
"I have benefited significantly by the early adoption and use of new products."3.584.34p < 0.01
"I have tested prototype versions of new products for manufacturers."4.945.65p < 0.05
"In my sport I am regarded as being on the "cutting edge."4.565.38p < 0.01
"I improved and developed new techniques in boardercrossing."4.295.84p < 0.001
Lead user characteristic 2: high benefit from innovationd
"I have new needs which are not satisfied by existing products."3.274.38p < 0.001
"I am dissatisfied with the existing equipment."3.905.13p < 0.001
 114 Source: Franke and Shah 2003, table 3.
a. All values are means; n = 60.
b. All values are means; n = 129.
c. Two-tailed t-tests for independent samples.
d. Rated on seven-point scale, with 1 = very accurate and 7 = not accurate at all. Two-tailed t-tests for independent samples. 115 Innovation among Hospital Surgeons 116 Lýthje (2003) explored innovations developed by surgeons working at university clinics in Germany. Ten such clinics were chosen randomly, and 262 surgeons responded to Lýthje's questionnaire---a response rate of 32.6 percent. Of the university surgeons responding, 22 percent reported developing or improving some item(s) of medical equipment for use in their own practices. Using a logit model to determine the influence of user characteristics on innovation activity, Lýthje found that innovating surgeons tended to be lead users (p < 0.01). He also found that solutions to problems encountered in their own surgical practices were the primary benefit that the innovating surgeons expected to obtain from the solutions they developed (p < 0.01). In addition, he found that the level of technical knowledge the surgeon held was significantly correlated with innovation (p < 0.05). Also, perhaps as one might expect in the field of medicine, the "contextual barrier" of concerns about legal problems and liability risks was found to have a strongly significant negative correlation with the likelihood of user invention by surgeons (p < 0.01). 117 With respect to the commercial value of the innovations the lead user surgeons had developed, Lýthje reported that 48 percent of the innovations developed by his lead user respondents were or soon would be marketed by manufacturers of medical equipment. 118 Discussion 119 The studies reviewed in this chapter all found that user innovations in general and commercially attractive ones in particular tended to be developed by lead users. These studies were set in a range of fields, but all were focused on hardware innovations or on information innovations such as new software. It is therefore important to point out that, in many fields, innovation in techniques is at least as important as equipment innovation. For example, many novel surgical operations are performed with standard equipment (such as scalpels), and many novel innovations in snowboarding are based on existing, unmodified equipment. Technique-only innovations are also likely to be the work of lead users, and indeed many of the equipment innovations documented in the studies reviewed here involved innovations in technique as well as innovations in equipment. 120 Despite the strength of the findings, many interesting puzzles remain that can be addressed by the further development of lead user theory. For example, empirical studies of innovation by lead users are unlikely to have sampled the world's foremost lead users. Thus, in effect, the studies reviewed here determined lead users to be those highest on lead user characteristics that were within their samples. Perhaps other samples could have been obtained in each of the fields studied containing users that were even more "leading edge" with respect to relevant market trends. If so, why were the samples of moderately leading-edge users showing user innovation if user innovation is concentrated among "extreme" lead users? There are at least three possible explanations. First, most of the studies of user innovation probably included users reasonably close to the global leading edge in their samples. Had the "top" users been included, perhaps the result would have been that still more attractive user innovations would have been found. Second, it may be that the needs of local user communities differ, and so local lead users really may be the world's lead users with respect to their particular needs. Third, even if a sample contains lead users that are not near the global top with respect to lead users' characteristics, local lead users might still have reasons to (re)develop innovations locally. For example, it might be cheaper, faster, more interesting, or more enjoyable to innovate than to search for a similar innovation that a "global top" lead user might already have developed. 121 3 Why Many Users Want Custom Products 122 The high rates of user innovation documented in chapter 2 suggest that many users may want custom products. Why should this be so? I will argue that it is because many users have needs that differ in detail, and many also have both sufficient willingness to pay and sufficient resources to obtain a custom product that is just right for their individual needs. In this chapter, I first present the case for heterogeneity of user needs. I then review a study that explores users' heterogeneity of need and willingness to pay for product customization. 123 Heterogeneity of User Needs 124 If many individual users or user firms want something different in a product type, it is said that heterogeneity of user need for that product type is high. If users' needs are highly heterogeneous, only small numbers of users will tend to want exactly the same thing. In such a case it is unlikely that mass-produced products will precisely suit the needs of many users. Mass manufacturers tend to want to build products that will appeal to more users rather than fewer, so as to spread their fixed costs of development and production. If many users want something different, and if they have adequate interest and resources to get exactly the product they need, they will be driven either to develop it for themselves or to pay a custom manufacturer to develop it for them. 125 Are users' needs for new products (and services) often highly heterogeneous? A test of reason suggests that they are. An individual's or a firm's need for a many products depends on detailed considerations regarding the user's initial state and resources, on the pathway the user must traverse to get from the initial state to the preferred state, and on detailed considerations regarding their preferred end state as well. These are likely to be different for each individual user and for each user firm at some level of detail. This, in turn, suggests that needs for many new products and services that are precisely right for each user will differ: that needs for those products will be highly heterogeneous. 126 Suppose, for example, that you decide you need a new item of household furnishing. Your house is already furnished with hundreds of items, big and small, and the new item must "fit in" properly. In addition, your precise needs for the new item are likely to be affected by your living situation, your resources, and your preferences. For example: "We need a new couch that Uncle Bill will like, that the kids can jump on, that matches the wallpaper I adore, that reflects my love of coral reefs and overall good taste, and that we can afford." Many of these specific constraints are not results of current whim and are not easy to change. Perhaps you can change the wallpaper, but you are less likely to change Uncle Bill, your kids, your established tastes with respect to a living environment, or your resource constraints. 127 The net result is that the most desired product characteristics might be specific to each individual or firm. Of course, many will be willing to satisfice---make compromises---on many items because of limits on the money or time they have available to get exactly what they want. Thus, a serious mountain biker may be willing to simply buy almost any couch on sale even if he or she is not fully happy with it. On the other hand, that same biker may be totally unwilling to compromise about getting mountain biking equipment that is precisely right for his or her specific needs. In terms of industrial products, NASA may insist on getting precisely right components for the Space Shuttle if they affect mission safety, but may be willing to satisfice on other items. 128 Evidence from Studies of User Innovation 129 Two studies of innovation by users provide indirect information on the heterogeneity of user need. They provide descriptions of the functions of the innovations developed by users in their samples. Inspection of these descriptions shows a great deal of variation and few near-duplicates. Different functionality, of course, implies that the developers of the products had different needs. In the 2000 study of user modifications of library IT systems by Morrison, Roberts, and von Hippel, discussed earlier, only 14 of 39 innovations are functionally similar to any other innovations in the sample. If one type of functionality that was repeatedly developed ("web interface") is excluded, the overlap is even lower (see table 2.2). Other responses by study participants add to this impression of high heterogeneity of need among users. Thirty percent of the respondents reported that their library IT system had been highly customized by the manufacturer during installation to meet their specific needs. In addition, 54 percent of study respondents agreed with the statement "We would like to make additional improvements to our IT system functionality that can't be made by simply adjusting the standard, customer-accessible parameters provided by the supplier." 130 Similar moderate overlap in the characteristics of user innovations can be seen in innovation descriptions provided in the study of mountain biking by Lýthje, Herstatt, and von Hippel (2002). In that study sample, I estimate that at most 10 of 43 innovations had functionality similar to that of another sample member. This diversity makes sense: mountain biking, which outsiders might assume is a single type of athletic activity, in fact has many subspecialties. 131 As can be seen in table 3.1, the specializations of mountain bikers in the our study sample involved very different mountain biking terrains, and important variations in riding conditions and riding specializations. The innovations users developed were appropriate to their own heterogeneous riding activities and so were quite heterogeneous in function. Consider three examples drawn from our study: 132 I ride on elevated, skinny planks and ladders, do jumps, steep technical downhills, obstacles and big drops. Solution devised: I needed sophisticated cycling armor and protective clothing. So I designed arm and leg armor, chest protection, shorts, pants and a jacket that enable me to try harder things with less fear of injury. 133 I do back-country touring and needed a way to easily lift and carry a fully loaded mountain bike on the sides of steep hills and mountains and dangle it over cliffs as I climbed. Solution devised: I modified the top tube and the top of my seat post to provide secure attachment points for a carrying strap, then I modified a very plush and durable mountaineering sling to serve as the over-shoulder strap. Because the strap sits up high, I only need to bend my knees a little bit to lift the bike onto my shoulders, yet it is just high enough to keep the front wheel from hitting when I am climbing a steep hill. Eventually, I came up with a quick-release lateral strap to keep the main strap from sliding off my shoulder, but it will easily break away if I fall or land in a fast river and need to ditch my bike. 134 When riding on ice, my bike has no traction and I slip and fall. Solution devised: I increased the traction of my tires by getting some metal studs used by the auto industry for winter tires. Then I selected some mountain biking tires with large blocks of rubber in the tread pattern, drilled a hole in the center of each block and inserted a stud in each hole. 135 Table 3.1 Activity specializations of innovating mountain bikers. 136
Preferred terrainNumber of bikersOutside conditionsNumber of bikersFocus on particular riding abilitiesNumber of bikers
Fast downhill tracks (steep, drops, fast)44 (39.6%)Darkness, night riding45 (40.5%)Jumps, drops, stunts, obstacles34 (30.6%)
Technical single tracks (up and down, rocky, jumps)68 (61.3%)Snow, ice, cold60 (54.1%)Technical ability/balance22 (19.8%)
Smooth single tracks (hilly, rolling, speed, sand, hardpack)13 (11.7%)Rain, mud53 (47.7%)Fast descents / downhill34 (30.6%)
Urban and streets9 (8.1%)Heat15 (13.5%)Endurance9 (8.1%)
No special terrain preferred5 (4.5%)High altitude10 (9.0%)Climbing17 (13%)
No extreme outside conditions29 (26.1%)Sprint3 (2.7%)
No focus on specific riding ability36 (32.4%)
 137 Source: Lýthje,Herstatt, and vonHippel 2002. This table includes the 111 users in the study sample who had ideas for improvements to mountain biking equipment. (Of these, 61 had actually gone on to build the equipment they envisioned.) Many of these users reported experience in more than one category of activity, so the sum in each column is higher than 111. 138 Evidence from Studies of Market Segmentation 139 Empirical data on heterogeneity of demand for specific products and services are sparse. Those most interested in studying the matter are generally mass manufacturers of products and services for consumers---and they do not make a practice of prospecting for heterogeneity. Instead, they are interested in finding areas where users' needs are similar enough to represent profitable markets for standard products produced in large volumes. Manufacturers customarily seek such areas via market-segmentation studies that partition markets into a very few segments---perhaps only three, four, or five. Each segment identified consists of customers with relatively similar needs for a particular product (Punj and Stewart 1983; Wind 1978). For example, toothpaste manufacturers may divide their markets into segments such as boys and girls, adults interested in tooth whitening, and so on. 140 Since the 1970s, nearly all market-segmentation studies have been carried out by means of cluster analysis (Green 1971; Green and Schaffer 1998). After cluster analysis places each participant in the segment of the market most closely matching his needs, a measure of within-segment need variation is determined. This is the proportion of total variation that is within each cluster, and it shows how much users' needs deviate from the averages in "their" respective segments. If within-segment variation is low, users within the segment will have fairly homogeneous needs, and so may be reasonably satisfied with a standard product designed to serve all customers in their segment. If it high, many users are likely to be dissatisfied---some seriously so. 141 Within-segment variation is seldom reported in published studies, but a survey of market-segmentation studies published in top-tier journals did find 15 studies reporting that statistic. These studies specified 5.5 clusters on average, and had an average remaining within-cluster variance of 46 percent (Franke and Reisinger 2003). Franke and von Hippel (2003b) found similar results in an independent sample. In that study, an average of 3.7 market segments were specified and 54 percent of total variance was left as within-segment variation after the completion of cluster analysis. These data suggest that heterogeneity of need might be very substantial among users in many product categories. 2 2 Cluster analysis does not specify the "right" number of clusters---it simply segments a sample into smaller and smaller clusters until the analyst calls a halt. Determining an appropriate number of clusters within a sample can be done in different ways. Of course, it always possible to say that "I only want to deal with three market segments, so I will stop my analysis when my sample has been segmented into three clusters." More commonly, analysts will examine the increase of squared error sums of each step, and generally will view the optimal number of clusters as having been reached when the plot shows a sudden "elbow" (Myers 1996). Since this technique does not incorporate information on remaining within-cluster heterogeneity, it can lead to solutions with a large amount of within-cluster variance. The "cubic clustering criterion" (CCC) partially addresses this concern by measuring the within-cluster homogeneity relative to the between-cluster heterogeneity. It suggests choosing the number of clusters where this value peaks (Milligan and Cooper 1985). However, this method appears to be rarely used: Ketchen and Shook (1996) found it used in only 5 of 45 segmentation studies they examined. 142 A Study of Heterogeneity and Willingness To Pay 143 A need for a novel product not on the market must be accompanied by adequate willingness to pay (and resources) if it is to be associated with the actual development or purchase of a custom product. What is needed to reliably establish the relationship among heterogeneity of demand, willingness to pay, and custom product development or purchase is studies that address all three factors in the same sample. My colleague Nikolaus Franke and I conducted one such study in a population of users of web server software, a product used primarily by industrial firms (Franke and von Hippel 2003b). 144 Franke and I looked in detail at users' needs for security features in Apache web server software, and at users' willingness to pay for solutions that precisely fit their needs. Apache web server software is open source software that is explicitly designed to allow modification by anyone having appropriate skills. Anyone may download open source software from the Internet and use it without charge. Users are also explicitly granted the legal right to study the software's source code, to modify the software, and to distribute modified or unmodified versions to others. (See chapter 7 for a full discussion of open source software.) 145 Apache web server software is used on web server computers connected to the Internet. A web server's function is to respond to requests from Internet browsers for particular documents or content. A typical server waits for clients' requests, locates the requested resource, applies the requested method to the resource, and sends the response back to the client. Web server software began by offering relatively simple functionality. Over time, however, Apache and other web server software programs have evolved into the complicated front end for many of the technically demanding applications that now run on the Internet. For example, web server software is now used to handle security and authentication of users, to provide e-commerce shopping carts, and gateways to databases. In the face of strong competition from commercial competitors (including Microsoft and Sun/Netscape), the Apache web server has become the most popular web server software on the Internet, used by 67 percent of the many millions of World Wide Web sites extant in early 2004. It has also received many industry awards for excellence. 146 Franke and I created a preliminary list of server security functions from published and web-based sources. The preliminary list was evaluated and corrected by experts in web server security and Apache web server software. We eventually ended up with a list of 45 security functions that some or many users might need. Solutions to some were already incorporated in the standard Apache code downloadable by users, others were available in additional modules, and a few were not yet addressed by any security module generally available to the Apache community. (Security threats can emerge quickly and become matters of great concern before a successful response is developed and offered to the general community. A recent example is site flooding, a form of attack in which vandals attempt to cause a website to fail by flooding it with a very large number of simultaneous requests for a response.) 147 Users of the security functions of web server software are the webmasters employed by firms to make sure that their software is up to date and functions properly. A major portion of a webmaster's job is to ensure that the software used is secure from attacks launched by those who wish illicit access or simply want to cause the software to fail in some way. We collected responses to our study questions from two samples of Apache webmasters: webmasters who posted a question or an answer on a question at the Apache Usenet Forum 3 and webmasters who subscribed to a specialized online Apache newsgroup. 4 This stratified sample gave us an adequate representation of webmasters who both did and did not have the technical skills needed to modify Apache security software to better fit their needs: subscribers to apache-modules.org tend to have a higher level of technical skills on average than those posting to the Apache Usenet Forum. Data were obtained by means of an Internet-based questionnaire. 3 <http://groups-beta.google.com/group/comp.infosystems.www.servers.unix> 4 <http://modules.apache.org/> 148 The Heterogeneity of Users' Needs 149 Franke and I found the security module needs of Apache users were very heterogeneous indeed both among those that had the in-house capability to write code to modify Apache and those that did not. The calibrated coefficient of heterogeneity, Hc, was 0.98, indicating that there was essentially no tendency of the users to cluster beyond chance. (We defined the "heterogeneity of need" in a group as the degree to which the needs of i individuals can be satisfied with j standard products which optimally meet their needs. This means that heterogeneity of need is high when many standard products are necessary to satisfy the needs of i individuals and low when the needs can be satisfied by a few standard products. The higher the coefficient the more heterogeneous are the needs of users in a sample. If the calibrated heterogeneity coefficient Hc equals 1, there is no systematic tendency of the users to cluster. If it is lower than 1, there is some tendency of the individuals to cluster. A coefficient of 0 means that the needs of all individuals are exactly the same. 5 ) 5 To measure heterogeneity, Franke and I analyzed the extent to which j standards, varying from [1; i], meet the needs of the i individuals in our sample. Conceptually, we first locate a product in multi-dimensional need space (dimensions = 45 in the case of our present study) that minimizes the distances to each individual's needs. (This step is analogous to the Ward's method in cluster analysis that also minimizes within cluster variation; see Punj and Stewart 1983.) The "error" is then measured as the sum of squared Euclidean distances. We then repeated these steps to determine the error for two optimally positioned products, three products, and so on up to a number equaling I -- 1. The sum of squared errors for all cases is then a simple coefficient that measures how much the needs of i individuals can be satisfied with j standard products. The "coefficient of heterogeneity" just specified is sensitive both to the (average) distance between the needs and for the configuration of the needs: when the needs tend to form clusters the heterogeneity coefficient is lower than if they are evenly spread. To make the coefficient comparable across different populations, we calibrate it using a bootstrapping technique (Efron 1979) involving dividing the coefficient by the expected value (this value is generated by averaging the heterogeneity of many random distributions of heterogeneity of the same kind). The average random heterogeneity coefficient is then an appropriate value for calibration purposes: it assumes that there is no systematic relationship between the needs of the individuals or between the need dimensions. 150 Even this understates the heterogeneity. Responding Apache webmasters went far beyond the 45 security-related functions of web server software that we offered for their evaluation. In our questionnaire we offered an open question asking users to list up to four additional needs they experienced that were not covered by the standard list. Nearly 50 percent used the opportunity to add additional functions. When duplicates were eliminated, we found that 92 distinct additional security-related needs had been noted by one or more webmaster users.6 6 Conceptually, it can be possible to generate "one perfect product" for everyone--- in which case heterogeneity of demand is zero---by simply creating all the features wanted by anyone (45 + 92 features in the case of this study), and incorporating them in the "one perfect product." Users could then select the features they want from a menu contained in the one perfect product to tailor it to their own tastes. Doing this is at least conceptually possible in the case of software, but less so in the case of a physical product for two reasons: (1) delivering all possible physical options to everyone who buys the product would be expensive for physical goods (while costing nothing extra in the case of information products); (2) some options are mutually exclusive (an automobile cannot be both red and green at the same time). 151 High heterogeneity of need in our sample suggests that there should be a high interest in obtaining modifications to Apache---and indeed, overall satisfaction with the existing version was only moderate. 152 Willingness to Pay for Improvements 153 It is not enough to want a better-fitting custom product. One must also be willing and able to pay to get what one wants. Those in the Apache sample who did innovate were presumably willing to pay the price to do so. But how much were the users in our sample---the innovators and the non-innovators--- willing to pay now for improvements? Estimating a user's willingness to pay (WTP) is known to be a difficult task. Franke and I used the contingent valuation method, in which respondents are directly asked how much they are willing to pay for a product or service (Mitchell and Carson 1989). Results obtained by that method often overestimate WTP significantly. Empirical studies that compare expressed WTP with actual cash payments on average showed actual spending behavior to be somewhat smaller than expressed WTP in the case of private purchases (such as in our case). In contrast, they generally find willingness to pay to be greatly overstated in the case of public goods such as the removal of a road from a wilderness area. 7 7 The difference between actual willingness to pay and expressed willingness to pay is much lower for private goods (our case) than for public goods. In the case of private goods, Loomis et al. (1996) found the expressed willingness to pay for art prints to be twice the actual WTP. Willis and Powe (1998) found that among visitors to a castle the expressed WTP was 60 percent lower than the actual WTP. In the case of public goods, Brown et al. (1996), in a study of willingness to pay for removal of a road from a wilderness area, found the expressed WTP to be 4--6 times the actual WTP. Lindsey and Knaap (1999), in a study of WTP for a public urban greenway, found the expressed WTP to be 2-10 times the actual WPT. Neil et al. (1994) found the expressed WTP for conserving an original painting in the desert to be 9 times the actual WTP. Seip and Strand (1992) found that less than 10 percent of those who expressed interest in paying to join an environmental organization actually joined. 154 To compensate for the likely overstatement of expressed relative to actual WTP in our study, Franke and I conservatively deflated respondents' indicated willingness to pay by 80 percent. (Although the product in question was intended for private use, webmasters were talking about their willingness to spend company money, not their own money.) We asked each user who had indicated that he was not really satisfied with a function (i.e., whose satisfaction with the respective function was 4 or less on a 7-point scale, where 1 = not satisfied at all, and 7 = very satisfied) to estimate how much he would be willing to pay to get a very satisfactory solution regarding this function. After deflation, our sample of 137 webmasters said they were willing to pay $700,000 in aggregate to modify web server software to a point that fully satisfied them with respect to their security function needs. This amounts to an average of $5,232 total willingness to pay per respondent. This is a striking number because the price of commercial web server software similar to Apache's for one server was about $1,100 at the time of our study (source: www.sun.com, November 2001). If we assume that each webmaster was in charge of ten servers on average, this means that each webmaster was willing to pay half the price of a total server software package to get his heterogeneous needs for security features better satisfied. 155 Increased Satisfaction from Customization of Apache 156 Recall that it takes some technical skill to modify Apache web server software by writing new code. In table 3.2, Franke and I examined only the technically skilled users in our sample who claimed the capability of making modifications to Apache web server software. For these technically skilled users, we found significantly higher satisfaction levels among those that actually did customize their software---but even the users that made modifications were not fully satisfied. 157 Table 3.2 Skilled users who customized their software were more satisfied than those who did not customize. 158
Users who customized (n = 18)Users who did not customize (n = 44)Difference (one-tailed t-test)
Satisfaction with basic web server functionality5.54.30.100
Satisfaction with authentication of client3.01.00.001
Satisfaction with e-commerce-related functions1.30.00.023
Satisfaction with within-site user access control8.56.90.170
Satisfaction with other security functions3.93.90.699
Overall satisfaction4.32.60.010
 159 Source: Franke and von Hippel 2003, table 8. In this table, 45 individual functions are grouped into five general categories. The satisfaction index ranges from -21 to +21. 160 One might wonder why users with the ability to modify Apache closer to their liking were not totally satisfied. The answer can be found in respondents' judgments regarding how much effort it would require to modify Apache still more to their liking. We asked all respondents who indicated dissatisfaction of level 4 or lower with a specific function of Apache how much working time it would cost them to improve the function to the point where they would judge it to be very satisfactory (to be at a satisfaction level of 7). For the whole sample and all dissatisfactions, we obtained a working time of 8,938 person-days necessary to get a very satisfactory solution. This equals $78 of incremental benefit per incremental programmer working day ($716,758 divided by 8,938 days). This is clearly below the regular wages a skilled programmer gets. Franke and I concluded from this that skilled users do not improve their respective Apache versions to the point where they are perfectly satisfied because the costs of doing so would exceed the benefits. 161 Discussion 162 Heterogeneity of user need is likely to be high for many types of products. Data are still scanty, but high heterogeneity of need is a very straightforward explanation for why there is so much customization by users: many users have "custom" needs for products and services. 163 Those interested can easily enhance their intuitions about heterogenity of user need and related innovation by users. User innovation appears to be common enough so that one can find examples for oneself in a reasonably small, casual sample. Readers therefore may find it possible (and enjoyable) to do their own informal tests of the matter. My own version of such a test is to ask the students in one of my MIT classes (typically about 50 students) to think about a particular product that many use, such as a backpack. I first ask them how satisfied they are with their backpack. Initially, most will say "It's OK." But after some discussion and thinking, a few complaints will slowly begin to surface (slowly, I think, because we all take some dissatisfaction with our products as the unremarkable norm). "It doesn't fit comfortably" in this or that particular way. "When my lunch bag or thermos leaks the books and papers I am carrying get wet---there should be a water proof partition." "I carry large drawings to school rolled up in my backpack with the ends sticking out. They are ruined if it rains and I have not taken the precaution of wrapping them in plastic." Next, I ask whether any students have modified their backpacks to better meet their needs. Interestingly enough, one or two typically have. Since backpacks are not products of very high professional or hobby interest to most users, the presence of even some user innovation to adapt to individual users' unmet needs in such small, casual samples is an interesting intuition builder with respect to the findings discussed in this chapter. 164 4 Users' Innovate-or-Buy Decisions 165 Why does a user wanting a custom product sometimes innovate for itself rather than buying from a manufacturer of custom products? There is, after all, a choice---at least it would seem so. However, if a user with the resources and willingness to pay does decide to buy, it may be surprised to discover that it is not so easy to find a manufacturer willing to make exactly what an individual user wants. Of course, we all know that mass manufacturers with businesses built around providing standard products in large numbers will be reluctant to accommodate special requests. Consumers know this too, and few will be so foolish as to contact a major soup producer like Campbell's with a request for a special, "just-right" can of soup. But what about manufacturers that specialize in custom products? Isn't it their business to respond to special requests? To understand which way the innovate-or-buy choice will go, one must consider both transaction costs and information asymmetries specific to users and manufacturers. I will talk mainly about transaction costs in this chapter and mainly about information asymmetries in chapter 5. 166 I begin this chapter by discussing four specific and significant transaction costs that affect users' innovate-or-buy decisions. Next I review a case study that illustrates these. Then, I use a simple quantitative model to further explore when user firms will find it more cost-effective to develop a solution---a new product or service---for themselves rather than hiring a manufacturer to solve the problem for them. Finally, I point out that individual users can sometimes be more inclined to innovate than one might expect because they sometimes value the process of innovating as well as the novel product or service that is created. 167 Users' vs. Manufacturers' Views of Innovation Opportunities 168 Three specific contributors to transaction costs---in addition to the "usual suspects," such as opportunism---often have important effects on users' decisions whether to buy a custom product or to develop it for themselves. These are (1) differences between users' and manufacturers' views regarding what constitutes a desirable solution, (2) differences in innovation quality signaling requirements between user and manufacturer innovators, and (3) differences in legal requirements placed on user and manufacturer innovators. The first two of these factors involve considerations of agency costs. When a user hires a manufacturer to develop a custom product, the user is a principal that has hired the custom manufacturer as to act as its agent. When the interests of the principal and the agent are not the same, agency costs will result. Recall from chapter 1 that agency costs are (1) costs incurred to monitor the agent to ensure that it follows the interests of the principal, (2) the cost incurred by the agent to commit itself not to act against the principal's interest (the "bonding cost"), and (3) costs associated with an outcome that does not fully serve the interests of the principal (Jensen and Meckling 1976). In the specific instance of product and service development, agency considerations enter because a user's and a manufacturer's interests with respect to the development of a custom product often differ significantly. 169 Preferences Regarding Solutions 170 Individual products and services are components of larger user solutions. A user therefore wants a product that will make the best overall tradeoff between solution quality and price. Sometimes the best overall tradeoff will result in a willingness to pay a surprisingly large amount to get a solution component precisely right. For example, an individual user may specify tennis racket functionality that will fit her specific technique and relative strengths and will be willing to pay a great deal for exactly that racket. Deviations in racket functionality would require compensating modifications in her carefully practiced and deeply ingrained hitting technique---a much more costly overall solution from the user's point of view. In contrast, a user will be much less concerned with precisely how the desired functionality is attained. For example, tennis players will typically be unconcerned about whether a tennis racket is made from metal, carbon fiber, plastic or wood---or, for that matter, from mud---if it performs precisely as desired. And, indeed, users have quickly shifted to new types of rackets over the years as new materials promise a better fit to their particular functional requirements. 171 Of course, the same thing is true in the case of products for industrial users. For example, a firm with a need for a process machine may be willing to pay a great deal for one that is precisely appropriate to the characteristics of the input materials being processed, and to the skills of employees who will operate the machine. Deviations in either matter would require compensating modifications in material supply and employee training---likely to be a much more costly overall solution from the user's point of view. In contrast, the user firm will be much less concerned with precisely how the desired functionality is achieved by the process machine, and will care only that it performs precisely as specified. 172 Manufacturers faced with custom development requests from users make similar calculations, but theirs revolve around attempting to conserve the applicability of a low-cost (to them) solution. Manufacturers tend to specialize in and gain competitive advantage from their capabilities in one or a few specific solution types. They then seek to find as many profitable applications for those solutions types as possible. For example, a specialist in fabricating custom products from carbon fiber might find it profitable to make any kind of product---from airplane wings to tennis rackets---as long as they are made from carbon fiber. In contrast, that same manufacturer would have no competitive advantage in---and so no profit from making--- any of these same products from metal or wood. 173 Specializations in solution types can be very narrow indeed. For example, thousands of manufacturers specialize in adhesive-based fastening solutions, while other thousands specialize in mechanical fastening solutions involving such things as metal screws and nails. Importantly, companies that produce products and solution types that have close functional equivalence from the user's point of view can look very different from the point of view of a solution supplier. For example, a manufacturer of standard or custom adhesives needs chemists on staff with an expertise in chemical formulation. It also needs chemistry labs and production equipment designed to mix specialized batches of chemicals on a small scale, and it needs the equipment, expertise and regulatory approvals to package that kind of product in a way that is convenient to the customer and also in line with regulatory safeguards. In contrast, manufacturers specializing in standard or custom metal fastening solutions need none of these things. What they need instead are mechanical design engineers, a machine shop to build product prototypes and production tooling, specialized metal-forming production equipment such as screw machines, and so on. 174 Users, having an investment only in a need specification and not in a solution type, want the best functional solution to their problem, independent of solution type used. Manufacturers, in contrast, want to supply custom solutions to users that utilize their existing expertise and production capabilities. Thus, in the case of the two fastening technology alternatives just described, users will prefer whatever solution approach works best. In contrast, adhesives manufacturers will find it tremendously more attractive to create a solution involving adhesive-based fastening, and manufacturers specializing in mechanical fastening will similarly strongly prefer to offer to develop solutions involving mechanical fastening. 175 The difference between users' incentives to get the best functional solution to their need and specialist manufacturers' incentives to embed a specific solution type in the product to be developed are a major source of agency costs in custom product development, because there is typically an information asymmetry between user and manufacturer with respect to what will be the best solution. Manufacturers tend to know more than users about this and to have a strong incentive to provide biased information to users in order to convince them that the solution type in which they specialize is the best one to use. Such biases will be difficult for users to detect because, again, they are less expert than the suppliers in the various solution technologies that are candidates. 176 Theoretically, this agency cost would disappear if it were possible to fully specify a contract (Aghion and Tirole 1994; Bessen 2004). But in product development, contracting can be problematic. Information regarding characteristics of solutions and needs is inescapably incomplete at the time of contracting---users cannot fully specify what they want in advance of trying out prototype solutions, and manufacturers are not fully sure how planned solution approaches will work out before investing in customer-specific development. 177 Users' Expectations 178 When users buy a product from manufacturers, they tend to expect a package of other services to come along with the product they receive. However, when users develop a product for themselves, some of these are not demanded or can be supplied in a less formal, less expensive way by users for themselves. This set of implicit expectations can raise the cost to a user of a custom solution bought from a manufacturer relative to a home-developed solution. 179 Users typically expect a solution they have purchased to work correctly and reliably "right out of the box." In effect, a sharp line is drawn between product development at the manufacturer's site and routine, trouble-free usage at the purchaser's site. When the user builds a product for itself, however, both the development and the use functions are in the same organization and may explicitly be overlapped. Repeated tests and repeated repairs and improvements during early use are then more likely to be understood and tolerated as an acceptable part of the development process. 180 A related difference in expectations has to do with field support for a product that has been purchased rather than developed in house. In the case of a purchased custom product, users expect that manufacturers will provide replacement parts and service if needed. Responding to this expectation is costly for a custom manufacturer. It must keep a record of what it has built for each particular user, and of any special parts incorporated in that user's products so that they can be built or purchased again if needed. In contrast, if a user has developed a product for itself, it has people on site who know details of its design. These employees will be capable of rebuilding or repairing or redesigning the product ad hoc if and as the need arises. (Of course, if these knowledgeable employees leave the user firm while the product they designed is still in use, such informality can prove costly.) 181 Manufacturers also must invest in indirect quality signals that may not have an effect on actual quality, but instead are designed to assure both the specific user being served and the market in general that the product being supplied is of high quality. These represent another element of agency costs that user-innovators do not incur. When users develop an innovation for themselves, they end up intimately knowing the actual quality of the solution they have developed, and knowing why and how it is appropriate to their task. As an example, an engineer building a million-dollar process machine for in-house use might feel it perfectly acceptable to install a precisely right and very cheap computer controller made and prominently labeled by Lego, a manufacturer of children's toys. (Lego provides computer controllers for some of its children's building kit products.) But if that same engineer saw a Lego controller in a million-dollar process machine his firm was purchasing from a specialist high-end manufacturer, he might not know enough about the design details to know that the Lego controller was precisely right for the application. In that case, the engineer and his managers might well regard the seemingly inappropriate brand name as an indirect signal of bad quality. 182 Manufacturers are often so concerned about a reputation for quality that they refuse to take shortcuts that a customer specifically requests and that might make sense for a particular customer, lest others get wind of what was done and take it as a negative signal about the general quality of the firm's products. For example, you may say to a maker of luxury custom cars: "I want to have a custom car of your brand in my driveway---my friends will admire it. But I only plan to drive it to the grocery store once in a while, so I only want a cheap little engine. A luxury exterior combined with cheap parts is the best solution for me in this application---just slap something together and keep the price low." The maker is likely to respond: "We understand your need, but we cannot be associated with any product of low quality. Someone else may look under the hood some day, and that would damage our reputation as a maker of fine cars. You must look elsewhere, or decide you are willing to pay the price to keep one of our fine machines idle on your driveway." 183 Differing Legal and Regulatory Requirements 184 Users that innovate do not generally face legal risk if the product they develop fails and causes costs to themselves but not to others. In contrast, manufacturers that develop and sell new products are regarded under US law as also providing an implied warranty of "fitness for the intended use." If a product does not meet this criterion, and if a different, written warranty is not in place, manufacturers can be found liable for negligence with respect to providing a defective design and failure to warn buyers (Barnes and Ulin 1984). This simple difference can cause a large difference in exposure to liability by innovators and so can drive up the costs of manufacturer-provided solutions relative to user-provided ones. 185 For example, a user firm that builds a novel process controller to improve its plant operations must pay its own actual costs if the self-built controller fails and ruins expensive materials being processed. On the other hand, if a controller manufacturer designed the novel controller product and sold it to customers, and a failure then occurred and could be traced back to a fault in the design, the controller manufacturer is potentially liable for actual user costs and punitive damages. It may also incur significant reputational losses if the unhappy user broadcasts its complaints. The logical response of a controller manufacturer to this higher risk is to charge more and/or to be much more careful with respect to running exhaustive, expensive, and lengthy tests before releasing a new product. The resulting increase in cost and delay for obtaining a manufacturer-developed product can tend to tip users toward building their own, in-house solutions. 186 Net Result 187 A net result of the foregoing considerations is that manufacturers often find that developing a custom product for only one or a few users will be unprofitable. In such cases, the transaction costs involved can make it cheaper for users with appropriate capabilities to develop the product for themselves. In larger markets, in contrast, fixed transaction costs will be spread over many customers, and the economies of scale obtainable by producing for the whole market may be substantial. In that case, it will likely be cheaper for users to buy than to innovate. As a result, manufacturers, when contacted by a user with a very specific request, will be keenly interested in how many others are likely to want this solution or elements of it. If the answer is "few," a custom manufacturer will be unlikely to accept the project. 188 Of course, manufacturers have an incentive to make markets attractive from their point of view. This can be done by deviating from precisely serving the needs of a specific custom client in order to create a solution that will be "good enough" for that client but at the same time of more interest to others. Manufacturers may do this openly by arranging meetings among custom buyers with similar needs, and then urging the group to come up with a common solution that all will find acceptable. "After all," as the representative will say, "it is clear that we cannot make a special product to suit each user, so all of you must be prepared to make really difficult compromises!" More covertly, manufacturers may simply ignore some of the specific requests of the specific user client and make something that they expect to be a more general solution instead. 189 The contrasting incentives of users and manufacturers with respect to generality of need being served---and also with respect to the solution choice issue discussed earlier---can result in a very frustrating and cloudy interaction in which each party hides its best information and attempts to manipulate others to its own advantage. With respect to generality of need, sophisticated users understand custom suppliers' preference for a larger market and attempt to argue convincingly that "everyone will want precisely what I am asking you for." Manufacturers, in turn, know users have this incentive and so will generally prefer to develop custom products for which they themselves have a reasonable understanding of demand. Users are also aware of manufacturers' strong preference for only producing products that embody their existing solution expertise. To guard against the possibility that this incentive will produce biased advice, they may attempt to shop around among a number of suppliers offering different solution types and/or develop internal expertise on solution possibilities and/or attempt to write better contracts. All these attempts to induce and guard against bias involve agency costs. 190 An Illustrative Case 191 A case study by Sarah Slaughter (1993) illustrates the impact of some of the transaction costs discussed above related to users' innovate-or-buy decisions. Slaughter studied patterns of innovation in stressed-skin panels, which are used in some housing construction. The aspects of the panels studied were related to installation, and so the users of these features were home builders rather than home owners. When Slaughter contrasted users' costs of innovating versus buying, she found that it was always much cheaper for the builder to develop a solution for itself at a construction site than to ask a panel manufacturer to do so. 192 A stressed-skin panel can be visualized as a large 4-by-8-foot sandwich consisting of two panels made of plywood with a layer of plastic foam glued in between. The foam, about 4 inches thick, strongly bonds the two panels together and also acts as a layer of thermal insulation. In 1989, manufacturing of stressed-skin panels was a relatively concentrated industry; the four largest manufacturers collectively having a 77 percent share of the market. The user industry was much less concentrated: the four largest constructors of panelized housing together had only 1 percent of the market for such housing in 1989. 193 In housing construction, stressed-skin panels are generally attached to strong timber frames to form the outer shell of a house and to resist shear loads (such as the force of the wind). To use the panels in this way, a number of subsidiary inventions are required. For example, one must find a practical, long-lasting way to attach panels to each other and to the floors, the roof, and the frame. Also, one has to find a new way to run pipes and wires from place to place because there are no empty spaces in the walls to put them---panel interiors are filled with foam. 194 Stressed-skin panels were introduced into housing construction after World War II. From then till 1989, the time of Slaughter's study, 34 innovations were made in 12 functionally important areas to create a complete building system for this type of construction. Slaughter studied the history of each of these innovations and found that 82 percent had been developed by users of the stressed-skin panels---residential builders---and only 18 percent by manufacturers of stressed-skin panels. Sometimes more than one user developed and implemented different approaches to the same functional problem (table 4.1). Builders freely revealed their innovations rather than protecting them for proprietary advantage. They were passed from builder to builder by word of mouth, published in trade magazines, and diffused widely. All were replicated at building sites for years before any commercial panel manufacturer developed and sold a solution to accomplish the same function. 195 Histories of the user-developed improvements to stressed-skin panel construction showed that the user-innovator construction firms did not engage in planned R&D projects. Instead, each innovation was an immediate response to a problem encountered in the course of a construction project. Once a problem was encountered, the innovating builder typically developed and fabricated a solution at great speed, using skills, materials, and equipment on hand at the construction site. Builders reported that the average time from discovery of the problem to installation of the completed solution on the site was only half a day. The total cost of each innovation, including time, equipment, and materials, averaged $153. 196 Example: Installing Wiring in a Stressed-Skin Panel 197 A builder was faced with the immediate problem of how to route wires through the foam interior of panels to wall switches located in the middle of the panels. He did not want cut grooves or channels through the surfaces of the panels to these locations---that would dangerously reduce the panels' structural strength. His inventive solution was to mount an electrically heated wire on the tip of a long pole and simply push the heated tip through the center insulation layer of the panel. As he pushed, the electrically heated tip quickly melted a channel through the foam plastic insulation from the edge of the panel to the desired spot. Wires were then pulled through this channel. 198 Table 4.1 Users would have found it much more costly to get custom solutions from manufacturers. The costs of user-developed innovations in stressed-skin panels were very low. 199
FunctionAverage user development time (days)Average user development costNMinimimum cost of waiting for manufacturer to deliver
Framing of openings in panels0.1$201$1,400
Structural connection between panels0.1302$1,400
Ventilation of panels on roof0.1322$28,000
Insulated connection between panels0.1413$2,800
Corner connection between panels0.2601$2,800
Installation of HVAC in panels0.2602$2,800
Installation of wiring in panels0.2797$2,800
Connection of panels to roof0.2801$2,800
Add insect repellency to panels0.41233$70,000
Connect panels to foundation0.51601$1,400
Connect panels to frames1.23773$2,800
Development of curved panels5.01,5001$28,000
Average for all innovations0.5$153$12,367
 200 N represents number of innovations developed by users to carry out each listed function. Source: Slaughter 1993, tables 4 and 5. Costs and times shown are averaged for all user-developed innovations in each functional category. (The six manufacturer-developed innovations in Slaughter's sample are not included in this table.) 201 The builder-innovator reported that the total time to develop the innovation was only an hour, and that the total cost for time and materials equaled $40. How could it cost so little and take so little time? The builder explained that using hot wires to slice sheets of plastic foam insulation into pieces of a required length is a technique known to builders. His idea as to how to modify the slicing technique to melt channels instead came to him quickly. To test the idea, he immediately sent a worker to an electrical supply house to get some nichrome wire (a type of high-resistance wire often used as an electrical heating element), attached the wire to a tip of a pole, and tried the solution on a panel at the building site---and it worked! 202 This solution was described in detail in an article in a builder's magazine and was widely imitated. A panel manufacturer's eventual response (after the user solution had spread for a number of years) was to manufacture a panel with a channel for wires pre-molded into the plastic foam interior of the panel. This solution is only sometimes satisfactory. Builders often do not want to locate switch boxes at the height of the premolded channel. Also, sometimes construction workers will install some panels upside down in error, and the preformed channels will then not be continuous between one panel and the next. In such cases, the original, user-developed solution is again resorted to. 203 Example: Creating a Curved Panel 204 A builder was constructing a custom house with large, curved windows. Curved stressed-skin panels were needed to fill in the space above and below these windows, but panel manufacturers only sold flat panels at that time. The builder facing the problem could not simply buy standard flat panels and bend them into curved ones at the construction site---completed panels are rigid by design. So he bought plywood and plastic foam at a local building supply house and slowly bent each panel component separately over a curved frame quickly built at the construction site. He then bonded all three elements together with glue to create strong curved panels that would maintain their shape over time. 205 To determine whether users' decisions to innovate rather than buy made economic sense for them, Slaughter calculated, in a very conservative way, what it would have cost users to buy a manufacturer-developed solution embodied in a manufactured panel rather than build a solution for themselves. Her estimates included only the cost of the delay a user-builder would incur while waiting for delivery of a panel incorporating a manufacturer's solution. Delay in obtaining a solution to a problem encountered at a construction site is costly for a builder, because the schedule of deliveries, subcontractors, and other activities must then be altered. For example, if installation of a panel is delayed, one must also reschedule the arrival of the subcontractor hired to run wires through it, the contractor hired to paint it, and so on. Slaughter estimated the cost of delay to a builder at $280 per crew per day of delay (Means 1989). To compute delay times, she assumed that a manufacturer would always be willing to supply the special item a user requested. She also assumed that no time elapsed while the manufacturer learned about the need, contracted to do the job, designed a solution, and obtained needed regulatory approvals. She then asked panel manufacturers to estimate how long it would take them to simply construct a panel with the solution needed and deliver it to the construction site. Delay times computed in this manner ranged from 5 days for some innovations to 250 days for the longest-term one and averaged 44 days. 206 The conservative nature of this calculation is very clear. For example, Slaughter points out that the regulatory requirements for building components, not included, are in fact much more stringent for manufacturers than for user-builders in the field of residential construction. Manufacturers delivering products can be required to provide test data demonstrating compliance with local building codes for each locality served. Testing new products for compliance in a locality can take from a month to several years, and explicit code approval often takes several additional years. In contrast, a builder that innovates need only convince the local building inspector that what he has done meets code or performance requirements--- often a much easier task (Ehrenkrantz Group 1979; Duke 1988). 207 Despite her very conservative method of calculation, Slaughter found the costs to users of obtaining a builder solution to be at least 100 times the actual costs of developing a solution for themselves (table 4.1). Clearly, users' decisions to innovate rather than buy made economic sense in this case. 208 Modeling Users' Innovate-or-Buy Decisions 209 In this section I summarize the core of the argument discussed in this chapter via a simple quantitative model developed with Carliss Baldwin. Our goal is to offer additional clarity by trading off the richness of the qualitative argument for simplicity. 210 Whether a user firm should innovate or buy is a variant of a well-known problem: where one should place an activity in a supply chain. In any real-world case many complexities enter. In the model that follows, Baldwin and I ignore most of these and consider a simple base case focused on the impact of transaction costs on users' innovate-or-buy considerations. The model deals with manufacturing firms and user firms rather than individual users. We assume that user firms and manufacturer firms both will hire designers from the same homogeneous pool if they elect to solve a user problem. We also assume that both user firms and manufacturer firms will incur the same costs to solve a specific user problem. For example, they will have the same costs to monitor the performance of the designer employees they hire. In this way we simplify our innovate-or-buy problem to one of transaction costs only. 211 If there are no transaction costs (for example, no costs to write and enforce a contract), then by Coase's theorem a user will be indifferent between making or buying a solution to its problem. But in the real world there are transaction costs, and so a user will generally prefer to either make or buy. Which, from the point of view of minimizing overall costs of obtaining a problem solution, is the better choice under any given circumstances? 212 Let Vij be the value of a solution to problem j for user i. Let Nj be the number of users having problem j. Let Whj be the cost of solving problem j, where W = hourly wage and hj = hours required to solve it. Let Pj be the price charged by a manufacturer for a solution to problem j. Let T be fixed or "setup" transaction costs, such as writing a general contract for buyers of a solution to problem j. Let t be variable or "frictional" transaction costs, such as tailoring the general contract to a specific customer. 213 To explore this problem we make two assumptions. First, we assume that a user firm knows its own problems and the value of a solution to itself, Vij. Second, we assume that a manufacturer knows the number of users having each problem, Nj, and the value of solutions for each problem for all users, Vij. 214 These assumptions are in line with real-world incentives of users and manufacturers, although information stickiness generally prevents firms from getting full information. That is, users have a high incentive to know their own problems and the value to them of a solution. Manufacturers, in turn, have an incentive to invest in understanding the nature of problems faced by users in the target market, the number of users affected, and the value that the users would attach to getting a solution in order to determine the potential profitability of markets from their point of view. 215 We first consider the user's payoff for solving a problem for itself. A user has no transaction costs in dealing with itself, so a user's payoff for solving problem j will be Vij - Whj. Therefore, a user will buy a solution from an upstream manufacturer rather than develop one for itself if and only if P ≤ Whj. 216 Next we consider payoffs to a manufacturer for solving problem j. In this case, transaction costs such as those discussed in earlier sections will be encountered. With respect to transaction costs assume first that t = 0 but T > 0. Then, the manufacturer's payoff for solving problem j will be Vij - Whj, which needs to be positive in order for the manufacturer to find innovation attractive: 217 Nj Pj - Whj - T > 0. 218 But, as we saw, Pj ≤ Whj if the user is to buy, so we may substitute Whj for Pj in our inequality. Thus we obtain the following inequality as a condition for the user to buy: 219 Nj (Whj) - Whj - T > 0, 220 or 221 Nj > (T / Whj) + 1. 222 In other words, Baldwin and I find that the absolute lower bound on N is greater than 1. This means that a single user will always prefer to solve a unique problem j for itself (except in Coase's world, where T = 0, and the user will be indifferent). If every problem is unique to a single user, users will never choose to call on upstream manufacturers for solutions. 223 Now assume that T = 0 but t > 0. Then the condition for the user to buy rather than to innovate for itself becomes 224 Nj (Whj - t) - Whj > 0, 225 or equivalently (provided Whj > t) 226 Nj > Whj / (Whj - t) > 1. 227 Again, users will not call on upstream manufacturers to solve problems unique to one user. 228 The findings from the simplified model, then, are the following: Problems unique to one user will always be solved efficiently by users hiring designers to work for them in house. In contrast, problems affecting more than a moderate number of users, n, which is a function of the transaction costs, will be efficiently solved by the manufacturer hiring designers to develop the needed new product or service and then selling that solution to all users affected by the problem. However, given sufficient levels of T and/or of t, problems affecting more than one but fewer than n users will not be solved by a manufacturer, and so there will be a market failure: Assuming an institutional framework consisting only of independent users and manufacturers, multiple users will have to solve the same problem independently. 229 As illustration, suppose that t = 0.25Whj and T = 10Whj. Then, combining the two expressions and solving for n yields 230 n = (11Whj /0.75Whj) = 14.66. 231 The condition for the user to buy the innovation rather than innovate itself becomes Nj ≥ 15. For a number of users less than 15 but greater than 1, there will be a wasteful multiplication of user effort: several users will invest in developing the same innovation independently. 232 In a world that consists entirely of manufacturers and of users that do not share the innovations they develop, the type of wasteful duplicative innovation investment by users just described probably will occur often. As was discussed earlier in this chapter, and as was illustrated by Slaughter's study, substantial transaction costs might well be the norm. In addition, low numbers of users having the same need---situations where Nj is low---might also be the norm in the case of functionally novel innovations. Functionally novel innovations, as I will show later, tend to be developed by lead users, and lead users are by definition at the leading (low-Nj) edge of markets. 233 When the type of market failure discussed above does occur, users will have an incentive to search for institutional forms with a lower T and/or a lower t than is associated with assignment of the problem to an upstream manufacturer. One such institutional form involves interdependent innovation development among multiple users (for example, the institutional form used successfully in open source software projects that I will discuss in chapter 7). Baldwin and Clark (2003) show how this form can work to solve the problem of wasteful user innovation investments that were identified in our model. They show that, given modularity in the software's architecture, it will pay for users participating in open source software projects to generate and freely reveal some components of the needed innovation, benefiting from the fact that other users are likely to develop and reveal other components of that innovation. At the limit, the wasteful duplication of users' innovative efforts noted above will be eliminated; each innovation component will have been developed by only one user, but will be shared by many. 234 Benefiting from the Innovation Process 235 Some individual users (not user firms) may decide to innovate for themselves rather than buy even if a traditional accounting evaluation would show that they had made a major investment in time and materials for an apparently minor reward in product functionality. The reason is that individual users may gain major rewards from the process of innovating, in addition to rewards from the product being developed. Make-or-buy evaluations typically include factors such as the time and materials that must be invested to develop a solution. These costs are then compared with the likely benefits produced by the project's "output"---the new product or service created---to determine whether the project is worth doing. This was the type of comparison made by Slaughter, for example, in assessing whether it would be better for the users to make or to buy the stressed-skin panel innovations in her sample. However, in the case of individual user-innovators, this type of assessment can provide too narrow a perspective on what actually constitutes valuable project output. Specifically, there is evidence that individuals sometimes greatly prize benefits derived from their participation in the process of innovation. The process, they say, can produce learning and enjoyment that is of high value to them. 236 In the introductory chapter, I pointed out that some recreational activities, such as solving crossword puzzles, are clearly engaged in for process rewards only: very few individuals value the end "product" of a completed puzzle. But process rewards have also been found to be important for innovators that are producing outputs that they and others do value (Hertel, Niedner, and Herrmann 2003; Lakhani and Wolf 2005). Lakhani and Wolf studied a sample of individuals (n = 684, response rate = 34 percent) who had written new software code and contributed it to an open source project. They asked the programmers to list their three most important reasons for doing this. Fifty-eight percent of respondents said that an important motivation for writing their code was that they had a work need (33 percent), or a non-work need (30 percent) or both (5 percent) for the code itself. That is, they valued the project's "output" as this is traditionally viewed. However, 45 percent said that one of their top three reasons for writing code was intellectual stimulation, and 41 percent said one of their top three reasons was to improve their own programming skills (Lakhani and Wolf 2005, table 6). Elaborating on these responses, 61 percent of respondents said that their participation in the open source project was their most creative experience or was as creative as their most creative experience. Also, more than 60 percent said that "if there were one more hour in the day" they would always or often dedicate it to programming. 237 Csikszentmihalyi (1975, 1990, 1996) systematically studied the characteristics of tasks that individuals find intrinsically rewarding, such as rock climbing. He found that a level of challenge somewhere between boredom and fear is important, and also that the experience of "flow" gained when one is fully engaged in a task is intrinsically rewarding. Amabile (1996) proposes that intrinsic motivation is a key determining factor in creativity. She defines a creative task as one that is heuristic in nature (with no predetermined path to solution), and defines a creative outcome as a novel and appropriate (useful) response to such a task. Both conditions certainly can apply to the task of developing a product or a service. 238 In sum, to the extent that individual user-innovators benefit from the process of developing or modifying a product as well as from the product actually developed, they are likely to innovate even when the benefits expected from the product itself are relatively low. (Employees of a firm may wish to experience this type of intrinsic reward in their work as well, but managers and commercial constraints may give them less of an opportunity to do so. Indeed, "control over my own work" is cited by many programmers as a reason that they enjoy creating code as volunteers on open source projects more than they enjoy coding for their employers for pay.) 239 5 Users' Low-Cost Innovation Niches 240 The Problem-Solving Process 241 Product and service development is at its core a problem-solving process. Research into the nature of problem solving shows it to consist of trial and error, directed by some amount of insight as to the direction in which a solution might lie (Baron 1988). Trial and error has also been found to be prominent in the problem-solving work of product and process development (Marples 1961; Allen 1966; von Hippel and Tyre 1995; Thomke 1998, 2003). 242 Trial-and-error problem solving can be envisioned as a four-phase cycle that is typically repeated many times during the development of a new product or service. Problem solvers first conceive of a problem and a related solution based on their best knowledge and insight. Next, they build a physical or virtual prototype of both the possible solution they have envisioned and the intended use environment. Third, they run the experiment---that is, they operate their prototyped solution and see what happens. Fourth and finally, they analyze the result to understand what happened in the trial and to assess the "error information" that they gained. (In the trial-and-error formulation of the learning process, error is the new information or learning derived from an experiment by an experimenter: it is the aspect(s) of the outcome that the experimenter did not predict.) Developers then use the new learning to modify and improve the solution under development before building and running a new trial (figure 5.1). 243 Trial-and-error experimentation can be informal or formal; the underlying principles are the same. As an example on the informal side, consider a user experiencing a need and then developing what eventually turns out to be a new product: the skateboard. In phase 1 of the cycle, the user combines need and solution information into a product idea: "I am bored with roller skating. How can I get down this hill in a more exciting way? Maybe it would be fun to put my skates' wheels under a board and ride down on that." In phase 2, the user builds a prototype by taking his skates apart and hammering the wheels onto the underside of a board. In phase 3, he runs the experiment by climbing onto the board and heading down the hill. In phase 4, he picks himself up from an inaugural crash and thinks about the error information he has gained: "It is harder to stay on this thing than I thought. What went wrong, and how can I improve things before my next run down the hill?" 244 [di_evh_f5-1.png] 245 Figure 5.1 The trial-and-error cycle of product development. 246 As an example of more formal experimentation, consider a product-development engineer working in a laboratory to improve the performance of an automobile engine. In phase 1, need and solution information are again combined into a design idea: "I need to improve engine fuel efficiency. I think that a more even expansion of the flame in the cylinders is a possible solution direction, and I think that changing the shape of the spark plug electrodes will improve this." In phase 2, the engineer builds a spark plug incorporating her new idea. In phase 3, she inserts the new spark plug into a lab test engine equipped with the elaborate instrumentation needed to measure the very rapid propagation of a flame in the cylinders of an auto engine and runs the test. In phase 4, she feeds the data into a computer and analyzes the results. She asks: "Did the change in spark plug design change the flame front as expected? Did it change fuel efficiency? How can I use what I have learned from this trial to improve things for the next one?" 247 In addition to the difference in formality, there is another important difference between these two examples. In the first example, the skateboard user was conducting trial and error with a full prototype of the intended product in a real use environment---his own. In the second example, the experimental spark plug might have been a full prototype of a real product, but it probably consisted only of that portion of a real spark plug that actually extends into a combustion chamber. Also, only aspects of the use environment were involved in the lab experiment. That is, the test engine was not a real auto engine, and it was not being operated in a real car traveling over real roads. 248 Experimentation is often carried out using simplified versions---models--- of the product being designed and its intended use environment. These models can be physical (as in the example just given), or they can be virtual (as in the case of thought experiments or computer simulations). In a computer simulation, both the product and the environment are represented in digital form, and their interaction is tested entirely within a computer. For example, one might make a digital model of an automobile and a crash barrier. One could then use a computer to simulate the crash of the model car into the model barrier. One would analyze the results by calculating the effects of that crash on the structure of the car. 249 The value of using models rather than the real thing in experimentation is twofold. First, it can reduce the cost of an experiment---it can be much cheaper to crash a simulated BMW than a real one. Second, it can make experimental results clearer by making them simpler or otherwise different than real life. If one is trying to test the effect of a small change on car safety, for example, it can be helpful to remove everything not related to that change from the experiment. For example, if one is testing the way a particular wheel suspension structure deforms in a crash, one does not have to know (or spend time computing) how a taillight lens will react in the crash. Also, in a real crash things happen only once and happen very fast. In a virtual crash executed by computer, on the other hand, one can repeat the crash sequence over and over, and can stretch time out or compress it exactly as one likes to better understand what is happening (Thomke 2003). 250 Users and others experimenting with real prototypes in real use environments can also modify things to make tests simpler and clearer. A restaurant chef, for example, can make slight variations in just a small part of a recipe each time a customer calls for it, in order to better understand what is happening and make improvements. Similarly, a process machine user can experiment with only a small portion of machine functioning over and over to test changes and detect errors. 251 Sometimes designers will test a real experimental object in a real experimental context only after experimenting with several generations of models that isolate different aspects of the real and/or encompass increasing amounts of the complexity of the real. Developers of pharmaceuticals, for example, might begin by testing a candidate drug molecule against just the purified enzyme or receptor it is intended to affect, then test it again and again against successively more complex models of the human organism (tissue cultures, animal models, etc.) before finally seeking to test its effect on real human patients during clinical trials (Thomke, von Hippel, and Franke 1998). 252 Sticky Information 253 Any experiment is only as accurate as the information that is used as inputs. If inputs are not accurate, outcomes will not be accurate: "garbage in, garbage out." 254 The goal of product development and service development is to create a solution that will satisfy needs of real users within real contexts of use. The more complete and accurate the information on these factors, the higher the fidelity of the models being tested. If information could be transferred costlessly from place to place, the quality of the information available to problem solvers would or could be independent of location. But if information is costly to transfer, things are different. User-innovators, for example, will then have better information about their needs and their use context than will manufacturers. After all, they create and live in that type of information in full fidelity! Manufacturer-innovators, on the other hand, must transfer that information to themselves at some cost, and are unlikely to be able to obtain it in full fidelity at any cost. However, manufacturers might well have a higher-fidelity model of the solution types in which they specialize than users have. 255 It turns out that much information needed by product and service designers is "sticky." In any particular instance, the stickiness of a unit of information is defined as the incremental expenditure required to transfer that unit of information to a specified location in a form usable by a specified information seeker. When this expenditure is low, information stickiness is low; when it is high, stickiness is high (von Hippel 1994). That information is often sticky has been shown by studying the costs of transferring information regarding fully developed process technology from one location to another with full cooperation on both sides. Even under these favorable conditions, costs have been found to be high---leading one to conclude that the costs of transferring information during product and service development are likely to be at least as high. Teece (1977), for example, studied 26 international technology-transfer projects and found that the costs of information transfer ranged from 2 percent to 59 percent of total project costs and averaged 19 percent---a considerable fraction. Mansfield et al. (1982) also studied a number of projects involving technology transfer to overseas plants, and also found technology-transfer costs averaging about 20 percent of total project costs. Winter and Suzlanski (2001) explored replication of well-known organizational routines at new sites and found the process difficult and costly. 256 Why is information transfer so costly? The term "stickiness" refers only to a consequence, not to a cause. Information stickiness can result from causes ranging from attributes of the information itself to access fees charged by an information owner. Consider tacitness---a lack of explicit encoding. Polanyi (1958, pp. 49--53) noted that many human skills are tacit because "the aim of a skilful performance is achieved by the observance of a set of rules which are not known as such to the person following them." For example, swimmers are probably not aware of the rules they employ to keep afloat (e.g., in exhaling, they do not completely empty their lungs), nor are medical experts generally aware of the rules they follow in order to reach a diagnosis of a disease. "Indeed," Polanyi says, "even in modern industries the indefinable knowledge is still an essential part of technology." Information that is tacit is also sticky because it cannot be transferred at low cost. As Polanyi points out, "an art which cannot be specified in detail cannot be transmitted by prescription, since no prescription for it exists. It can be passed on only by example from master to apprentice. . . ." Apprenticeship is a relatively costly mode of transfer. 257 Another cause of information stickiness is related to absorptive capacity. A firm's or an individual's capacity to absorb new, outside technical information is largely a function of prior related knowledge (Cohen and Levinthal 1990). Thus, a firm knowing nothing about circuit design but seeking to apply an advanced technique for circuit engineering may be unable to apply it without first learning more basic information. The stickiness of the information about the advanced technique for the firm in question is therefore higher than it would be for a firm that already knows that basic information. (Recall that the stickiness of a unit of information is defined as the incremental expenditure required to transfer a unit of information to a specified site in a form usable by a specific information seeker.) 258 Total information stickiness associated with solving a specific problem is also determined by the amount of information required by a problem solver. Sometimes a great deal is required, for two reasons. First, as Rosenberg (1976, 1982) and Nelson (1982, 1990) point out, much technological knowledge deals with the specific and the particular. Second, one does not know in advance of problem solving which particular items will be important. 259 An example from a study by von Hippel and Tyre (1995) illustrates both points nicely. Tyre and I studied how and why novel production machines failed when they were first introduced into factory use. One of the machines studied was an automated machine used by a computer manufacturing firm to place large integrated circuits onto computer circuit boards. The user firm had asked an outside group to develop what was needed, and that group had developed and delivered a robot arm coupled to a machine-vision system. The arm, guided by the vision system, was designed to pick up integrated circuits and place them on a circuit board at precise locations. 260 Upon being installed in the factory, the new component-placing machine failed many times as a result of its developers' lack of some bit of information about the need or use environment. For example, one day machine operators reported that the machine was malfunctioning---again---and they did not know why. Investigation traced the problem to the machine-vision system. This system used a small TV camera to locate specific metalized patterns on the surface of each circuit board being processed. To function, the system needed to "see" these metalized patterns clearly against the background color of the board's surface. The vision system developed by the machine-development group had functioned properly in their lab when tested with sample boards from the user factory. However, the field investigation showed that in the factory it failed when boards that were light yellow in color were being processed. 261 The fact that some of the boards being processed were sometimes light yellow was a surprise to the machine developers. The factory personnel who had set the specifications for the machine knew that the boards they processed varied in color; however, they had not volunteered the information, because they did not know that the developers would be interested. Early in the machine-development process, they had simply provided samples of boards used in the factory to the machine-development group. And, as it happened, these samples were green. On the basis of the samples, developers had then (implicitly) assumed that all boards processed in the field were green. It had not occurred to them to ask users "How much variation in board color do you generally experience?" Thus, they had designed the vision system to work successfully with boards that were green. 262 In the case of this field failure, the item of information needed to understand or predict this problem was known to the users and could easily have been provided to the machine developers---had the developers thought to ask and/or had users thought to volunteer it. But in the actual evolution of events this was not done. The important point is that this omission was not due to poor practice; it was due to the huge amount of information about the need and the use environment that was potentially relevant to problem solvers. Note that the use environment and the novel machine contain many highly specific attributes that could potentially interact to cause field problems. Note also that the property of the board causing this particular type of failure was very narrow and specific. That is, the problem was not that the board had physical properties, nor that it had a color. The problem was precisely that some boards were yellow, and a particular shade of yellow at that. Since a circuit board, like most other components, has many attributes in addition to color (shape, size, weight, chemical composition, resonant frequency, dielectric constant, flexibility, and so on), it is likely that problem solvers seeking to learn everything they might need to know about the use and the use environment would have to collect a very large (perhaps unfeasibly large) number of very specific items of information. 263 Next, consider that the information items the problem solver will actually need (of the many that exist) are contingent on the solution path taken by the engineer designing the product. In the example, the problem caused by the yellow color of the circuit board was contingent on the design solution to the component-placing problem selected by the engineer during the development process. That is, the color of the circuit boards in the user factory became an item the problem solvers needed to know only when engineers, in the course of their development of the component placer, decided to use a vision system in the component-placing machine they were designing, and the fact that the boards were yellow became relevant only when the engineers chose a video camera and lighting that could not distinguish the metalized patterns on the board against a yellow background. Clearly, it can be costly to transfer the many items of information that a product or service developer might require---even if each individual item has low stickiness---from one site to another. 264 How Information Asymmetries Affect User Innovation vs. Manufacturer Innovation 265 An important consequence of information stickiness is that it results in information asymmetries that cannot be erased easily or cheaply. Different users and manufacturers will have different stocks of information, and may find it costly to acquire information they need but do not have. As a result, each innovator will tend to develop innovations that draw on the sticky information it already has, because that is the cheapest course of action (Arora and Gambardella 1994; von Hippel 1994). In the specific case of product development, this means that users as a class will tend to develop innovations that draw heavily on their own information about need and context of use. Similarly, manufacturers as a class will tend to develop innovations that draw heavily on the types of solution information in which they specialize. 266 This effect is visible in studies of innovation. Riggs and von Hippel (1994) studied the types of innovations made by users and manufacturers that improved the functioning of two major types of scientific instruments. 267 They found that users tended to develop innovations that enabled the instruments to do qualitatively new types of things for the first time. In contrast, manufacturers tended to develop innovations that enabled users to do the same things they had been doing, but to do them more conveniently or reliably (table 5.1). For example, users were the first to modify the instruments to enable them to image and analyze magnetic domains at sub-microscopic dimensions. In contrast, manufacturers were the first to computerize instrument adjustments to improve ease of operation. Sensitivity, resolution, and accuracy improvements fall somewhere in the middle, as the data show. These types of improvements can be driven by users seeking to do specific new things, or by manufacturers applying their technical expertise to improve the products along known dimensions of merit, such as accuracy. 268 Table 5.1 Users tend to develop innovations that deliver novel functions. 269
Type of improvement provided by innovationUserManufacturern
New functional capability82%18%17
Sensitivity, resolution, or accuracy improvement48%52%23
Convenience or reliability improvement13%87%24
Total sample size64
 270 Source: Riggs and von Hippel 1994, table 3. 271 The variation in locus of innovation for different types of innovations, seen in table 5.1 does fit our expectations from the point of view of sticky information considerations. But these findings are not controlled for profitability, and so it might be that profits for new functional capabilities are systematically smaller than profits obtainable from improvements made to existing functionality. If so, this could also explain the patterns seen. 272 Ogawa (1998) took the next necessary step and conducted an empirical study that did control for profitability of innovation opportunities. He too found the sticky-information effect---this time visible in the division of labor within product-development projects. He studied patterns in the development of a sample of 24 inventory-management innovations. All were jointly developed by a Japanese equipment manufacturer, NEC, and by a user firm, Seven-Eleven Japan (SEJ). SEJ, the leading convenience-store company in Japan, is known for its inventory management. Using innovative methods and equipment, it is able to turn over its inventory as many as 30 times a year, versus 12 times a year for competitors (Kotabe 1995). An example of such an innovation jointly developed by SEJ and NEC is just-in-time reordering, for which SEJ created the procedures and NEC the hand-held equipment to aid store clerks in carrying out their newly designed tasks. Equipment sales to SEJ are important to NEC: SEJ has thousands of stores in Japan. 273 The 24 innovations studied by Ogawa varied in the amount of sticky need information each required from users (having to do with store inventory- management practices) and the amount of sticky solution information required from manufacturers (having to do with new equipment technologies). Each also varied in terms of the profit expectations of both user and manufacturer. Ogawa determined how much of the design for each was done by the user firm and how much by the manufacturer firm. Controlling for profit expectations, he found that increases in the stickiness of user information were associated with a significant increase in the amount of need-related design undertaken by the user (Kendall correlation coefficient = 0.5784, P < 0.01). Conversely he found that increased stickiness of technology-related information was associated in a significant reduction in the amount of technology design done by the user (Kendall correlation coefficients = 0.4789, P < 0.05). In other words, need-intensive tasks within product-development projects will tend to be done by users, while solution-intensive ones will tend to be done by manufacturers. 274 Low-Cost Innovation Niches 275 Just as there are information asymmetries between users and manufacturers as classes, there are also information asymmetries among individual user firms and individuals, and among individual manufacturers as well. A study of mountain biking by Lýthje, Herstatt, and von Hippel (2002) shows that information held locally by individual user-innovators strongly affects the type of innovations they develop. Mountain biking involves bicycling on rough terrain such as mountain trails. It may also involve various other extreme conditions, such as bicycling on snow and ice and in the dark (van der Plas and Kelly 1998). 276 Mountain biking began in the early 1970s when some young cyclists started to use their bicycles off-road. Existing commercial bikes were not suited to this type of rough use, so early users put together their own bikes. They used strong bike frames, balloon tires, and powerful drum brakes designed for motorcycles. They called their creations "clunkers" (Penning 1998; Buenstorf 2002). 277 Commercial manufacture of mountain bikes began about 1975, when some of the early users of mountain bikes began to also build bikes for others. A tiny cottage industry developed, and by 1976 a half-dozen small assemblers existed in Marin County, California. In 1982, a small firm named Specialized, an importer of bikes and bike parts that supplied parts to the Marin County mountain bike assemblers, took the next step and brought the first mass-produced mountain bike to market. Major bike manufacturers then followed and started to produce mountain bikes and sell them at regular bike shops across the United States. By the mid 1980s the mountain bike was fully integrated in the mainstream bike market, and it has since grown to significant size. In 2000, about $58 billion (65 percent) of total retail sales in the US bicycle market were generated in the mountain bike category (National Sporting Goods Association 2002). 278 Mountain biking enthusiasts did not stop their innovation activities after the introduction of commercially manufactured mountain bikes. They kept pushing mountain biking into more extreme environmental conditions, and they continued to develop new sports techniques involving mountain bikes (Mountain Bike 1996). Thus, some began jumping their bikes from house roofs and water towers and developing other forms of acrobatics. As they did so, they steadily discovered needs for improvements to their equipment. Many responded by developing and building the improvements they needed for themselves. 279 Our sample of mountain bikers came from the area that bikers call the North Shore of the Americas, ranging from British Columbia to Washington State. Expert mountain bikers told us that this was a current "hot spot" where new riding styles were being developed and where the sport was being pushed toward new limits. We used a questionnaire to collect data from members of North Shore mountain biking clubs and from contributors to the mailing lists of two North Shore online mountain biking forums. Information was obtained from 291 mountain bikers. Nineteen percent of bikers responding to the questionnaire reported developing and building a new or modified item of mountain biking equipment for their own use. The innovations users developed were appropriate to the needs associated with their own riding specialties and were heterogeneous in function. 280 We asked mountain bikers who had innovated about the sources of the need and solution information they had used in their problem solving. In 84.5 percent of the cases respondents strongly agreed with the statement that their need information came from personal needs they had frequently experienced rather than from information about the needs of others. With respect to solution information, most strongly agreed with the statement that they used solution information they already had, rather than learning new solution information in order to develop their biking equipment innovation (table 5.2). 281 Table 5.2 Innovators tended to use solution information they already had "in stock" to develop their ideas. Tabulated here are innovators' answers to the question "How did you obtain the information needed to develop your solution?" 282
.MeanMedianVery high or high agreement
"I had it due to my professional background."4.22447.5%
"I had it from mountain biking or another hobby."4.56552.4%
"I learned it to develop this idea."2.11216%
 283 Source: Lýthje et al. 2003. N = 61. Responses were rated on a seven-point scale, with 1 = not at all true and 7 = very true. 284 Discussion 285 To the extent that users have heterogeneous and sticky need and solution information, they will have heterogeneous low-cost innovation niches. Users can be sophisticated developers within those niches, despite their reliance on their own need information and solution information that they already have in stock. On the need side, recall that user-innovators generally are lead users and generally are expert in the field or activity giving rise to their needs. With respect to solution information, user firms have specialties that may be at a world-class level. Individual users can also have high levels of solution expertise. After all, they are students or employees during the day, with training and jobs ranging from aerospace engineering to orthopedic surgery. Thus, mountain bikers might not want to learn orthopedic surgery to improve their biking equipment, but if they already are expert in that field they could easily draw on what they know for relevant solution information. Consider the following example drawn from the study of mountain biking discussed earlier: 286 I'm a human movement scientist working in ergonomics and biomechanics. I used my medical experience for my design. I calculated a frame design suitable for different riding conditions (downhill, climb). I did a CAD frame design on Catia and conceived a spring or air coil that can be set to two different heights. I plan to build the bike next year. 287 Users' low-cost innovation niches can be narrow because their development "labs" for such experimentation often consist largely of their individual use environment and customary activities. Consider, for example, the low-cost innovation niches of individual mountain bikers. Serious mountain bikers generally specialize in a particular type of mountain biking activity. Repeated specialized play and practice leads to improvement in related specialized skills. This, in turn, may lead to a discovery of a problem in existing mountain biking equipment and a responsive innovation. Thus, an innovating user in our mountain biking study reported the following: "When doing tricks that require me to take my feet off the bike pedals in mid-air, the pedals often spin, making it hard to put my feet back onto them accurately before landing." Such a problem is encountered only when a user has gained a high level of skill in the very specific specialty of jumping and performing tricks in mid-air. Once the problem has been encountered and recognized, however, the skilled specialist user can re-evoke the same problematic conditions at will during ordinary practice. The result is the creation of a low-cost laboratory for testing and comparing different solutions to that problem. The user is benefiting from enjoyment of his chosen activity and is developing something new via learning by doing at the same time. 288 In sharp contrast, if that same user decides to stray outside his chosen activity in order to develop innovations of interest to others with needs that are different from his own, the cost properly assignable to innovation will rise. To gain an equivalent-quality context for innovation, such a user must invest in developing personal skill related to the new innovation topic. Only in this way will he gain an equivalently deep understanding of the problems relevant to practitioners of that skill, and acquire a "field laboratory" appropriate to developing and testing possible solutions to those new problems. 289 Of course, these same considerations apply to user firms as well as to individual users. A firm that is in the business of polishing marble floors is a user of marble polishing equipment and techniques. It will have a low-cost learning laboratory with respect to improvements in these because it can conduct trial-and-error learning in that "lab" during the course of its customary business activities. Innovation costs can be very low because innovation activities are paid for in part by rewards unrelated to the novel equipment or technique being developed. The firm is polishing while innovating---and is getting paid for that work (Foray 2004). The low cost innovation niche of the marble polishing firm may be narrow. For example, it is unlikely to have any special advantage with respect to innovations in the polishing of wood floors, which requires different equipment and techniques. 290 6 Why Users Often Freely Reveal Their Innovations 291 Products, services, and processes developed by users become more valuable to society if they are somehow diffused to others that can also benefit from them. If user innovations are not diffused, multiple users with very similar needs will have to invest to (re)develop very similar innovations, which would be a poor use of resources from the social welfare point of view. Empirical research shows that new and modified products developed by users often do diffuse widely---and they do this by an unexpected means: user-innovators themselves often voluntarily publicly reveal what they have developed for all to examine, imitate, or modify without any payment to the innovator. 292 In this chapter, I first review evidence that free revealing is frequent. Next, I discuss the case for free revealing from an innovators' perspective, and argue that it often can be the best practical route for users to increase profit from their innovations. Finally, I discuss the implications of free revealing for innovation theory. 293 Evidence of Free Revealing 294 When my colleagues and I say that an innovator "freely reveals" proprietary information, we mean that all intellectual property rights to that information are voluntarily given up by that innovator and all parties are given equal access to it---the information becomes a public good (Harhoff, Henkel, and von Hippel 2003). For example, placement of non-patented information in a publicly accessible site such as a journal or public website would be free revealing as we define it. Free revealing as so defined does not mean that recipients necessarily acquire and utilize the revealed information at no cost to themselves. Recipients may, for example, have to pay for a subscription to a journal or for a field trip to an innovation site to acquire the information being freely revealed. Also, some may have to obtain complementary information or other assets in order to fully understand that information or put it to use. However, if the possessor of the information does not profit from any such expenditures made by its adopters, the information itself is still freely revealed, according to our definition. This definition of free revealing is rather extreme in that revealing with some small constraints, as is sometimes done, would achieve largely the same economic effect. Still, it is useful to discover that innovations are often freely revealed even in terms of this stringent definition. 295 Routine and intentional free revealing among profit-seeking firms was first described by Allen (1983). He noticed the phenomenon, which he called collective invention, in historical records from the nineteenth-century English iron industry. In that industry, ore was processed into iron by means of large furnaces heated to very high temperatures. Two attributes of the furnaces used had been steadily improved during the period 1850--1875: chimney height had been increased and the temperature of the combustion air pumped into the furnace during operation had been raised. These two technical changes significantly and progressively improved the energy efficiency of iron production---a very important matter for producers. Allen noted the surprising fact that employees of competing firms publicly revealed information on their furnace design improvements and related performance data in meetings of professional societies and in published material. 296 After Allen's initial observation, a number of other authors searched for free revealing among profit-seeking firms and frequently found it. Nuvolari (2004) studied a topic and time similar to that studied by Allen and found a similar pattern of free revealing in the case of improvements made to steam engines used to pump out mines in the 1800s. At that time, mining activities were severely hampered by water that tended to flood into mines of any depth, and so an early and important application of steam engines was for the removal of water from mines. Nuvolari explored the technical history of steam engines used to drain copper and tin mines in England's Cornwall District. Here, patented steam engines developed by James Watt were widely deployed in the 1700s. After the expiration of the Watt patent, an engineer named Richard Trevithick developed a new type of high-pressure engine in 1812. Instead of patenting his invention, he made his design available to all for use without charge. The engine soon became the basic design used in Cornwall. Many mine engineers improved Trevithick's design further and published what they had done in a monthly journal, Leans Engine Reporter. This journal had been founded by a group of mine managers with the explicit intention of aiding the rapid diffusion of best practices among these competing firms. 297 Free revealing has also been documented in the case of more recent industrial equipment innovations developed by users. Lim (2000) reports that IBM was first to develop a process to manufacture semiconductors that incorporated copper interconnections among circuit elements instead of the traditionally used aluminum ones. After some delay, IBM revealed increasing amounts of proprietary process information to rival users and to equipment suppliers. Widespread free revealing was also found in the case of automated clinical chemistry analyzers developed by the Technicon Corporation for use in medical diagnosis. After commercial introduction of the basic analyzer, many users developed major improvements to both the analyzer and to the clinical tests processed on that equipment. These users, generally medical personnel, freely revealed their improvements via publication, and at company-sponsored seminars (von Hippel and Finkelstein 1979). Mishina (1989) found free, or at least selective no-cost revealing in the lithographic equipment industry. He reported that innovating equipment users would sometimes reveal what they had done to machine manufacturers. Morrison, Roberts, and I, in our study of library IT search software (discussed in chapter 2 above), found that innovating users freely revealed 56 percent of the software modifications they had developed. Reasons given for not revealing the remainder had nothing to do with considerations of intellectual property protection. Rather, users who did not share said they had no convenient users' group forum for doing so, and/or they thought their innovation was too specialized to be of interest to others. 298 Innovating users of sports equipment also have been found to freely reveal their new products and product modifications. Franke and Shah (2003), in their study of four communities of serious sports enthusiasts described in chapter 2, found that innovating users uniformly agreed with the statement that they shared their innovation with their entire community free of charge---and strongly disagreed with the statement that they sold their innovations (p < 0.001, t-test for dependent samples). Interestingly, two of the four communities they studied engaged in activities involving significant competition among community members. Innovators in these two communities reported high but significantly less willingness to share, as one might expect in view of the potentially higher level of competitive loss free revealing would entail. 299 Contributors to the many open source software projects extant (more than 83,000 were listed on SourceForge.net in 2004) also routinely make the new code they have written public. Well-known open source software products include the Linux operating system software and the Apache web server computer software. Some conditions are attached to open source code licensing to ensure that the code remains available to all as an information commons. Because of these added protections, open source code does not quite fit the definition of free revealing given earlier in this chapter. (The licensing of open source software will be discussed in detail in chapter 7.) 300 Henkel (2003) showed that free revealing is sometimes practiced by directly competing manufacturers. He studied manufacturers that were competitors and that had all built improvements and extensions to a type of software known as embedded Linux. (Such software is "embedded in" and used to operate equipment ranging from cameras to chemical plants.) He found that these manufacturers freely revealed improvements to the common software platform that they all shared and, with a lag, also revealed much of the equipment-specific code they had written. 301 The Practical Case for Free Revealing 302 The "private investment model" of innovation assumes that innovation will be supported by private investment if and as innovators can make attractive profits from doing so. In this model, any free revealing or uncompensated "spillover" of proprietary knowledge developed by private investment will reduce the innovator's profits. It is therefore assumed that innovators will strive to avoid spillovers of innovation-related information. From the perspective of this model, then, free revealing is a major surprise: it seems to make no sense that innovators would intentionally give away information for free that they had invested money to develop. 303 In this subsection I offer an explanation for the puzzle by pointing out that free revealing is often the best practical option available to user innovators. Harhoff, Henkel, and von Hippel (2003) found that it is in practice very difficult for most innovators to protect their innovations from direct or approximate imitation. This means that the practical choice is typically not the one posited by the private investment model: should innovators voluntarily freely reveal their innovations, or should they protect them? Instead, the real choice facing user innovators often is whether to voluntarily freely reveal or to arrive at the same end state, perhaps with a bit of a lag, via involuntary spillovers. The practical case for voluntary free revealing is further strengthened because it can be accomplished at low cost, and often yields private benefits to the innovators. When benefits from free revealing exceed the benefits that are practically obtainable from holding an innovation secret or licensing it, free revealing should be the preferred course of action for a profit-seeking firm or individual. 304 Others Often Know Something Close to "Your" Secret 305 Innovators seeking to protect innovations they have developed as their intellectual property must establish some kind of monopoly control over the innovation-related information. In practice, this can be done either by effectively hiding the information as a trade secret, or by getting effective legal protection by patents or copyrights. (Trademarks also fall under the heading of intellectual property, but we do not consider those here.) In addition, however, it must be the case that others do not know substitute information that skirts these protections and that they are willing to reveal. If multiple individuals or firms have substitutable information, they are likely to vary with respect to the competitive circumstances they face. A specific innovator's ability to protect "its" innovation as proprietary property will then be determined for all holders of such information by the decision of the one having the least to lose by free revealing. If one or more information holders expect no loss or even a gain from a decision to freely reveal, then the secret will probably be revealed despite other innovators' best efforts to avoid this fate. 306 Commonly, firms and individuals have information that would be valuable to those seeking to imitate a particular innovation. This is because innovators and imitators seldom need access to a specific version of an innovation. Indeed, engineers seldom even want to see a solution exactly as their competitors have designed it: specific circumstances differ even among close competitors, and solutions must in any case be adapted to each adopter's precise circumstances. What an engineer does want to extract from the work of others is the principles and the general outline of a possible improvement, rather than the easily redevelopable details. This information is likely to be available from many sources. 307 For example, suppose you are a system developer at a bank and you are tasked with improving in-house software for checking customers' credit online. On the face of it, it might seem that you would gain most by studying the details of the systems that competing banks have developed to handle that same task. It is certainly true that competing banks may face market conditions very similar to your bank, and they may well not want to reveal the valuable innovations they have developed to a competitor. However, the situation is still by no means bleak for an imitator. There are also many non-bank users of online credit checking systems in the world---probably millions. Some will have innovated and be willing to reveal what they have done, and some of these will have the information you need. The likelihood that the information you seek will be freely revealed by some individual or firm is further enhanced by the fact that your search for novel basic improvements may profitably extend far beyond the specific application of online credit checking. Other fields will also have information on components of the solution you need. For example, many applications in addition to online credit checking use software components designed to determine whether persons seeking information are authorized to receive it. Any can potentially be a provider of information for this element of your improved system. 308 A finding by Lakhani and von Hippel (2003) illustrates the possibility that many firms and individuals may have similar information. Lakhani and von Hippel studied Apache help-line websites. These sites enable users having problems with Apache software to post questions, and others to respond with answers. The authors asked those who provided answers how many other help-line participants they thought also knew a solution to specific and often obscure problems they had answered on the Apache online forum. Information providers generally were of the opinion that some or many other help-line participants also knew a solution, and could have provided an answer if they themselves had not done so (table 6.1). 309 Table 6.1 Even very specialized information is often widely known. Tabulated here are answers to a question asked of help-line information providers: "How many others do you think knew the answer to the question you answered?" 310
Frequent providers (n = 21)
Other providers (n = 67)
Many38%61%
A few with good Apache knowledge38%18%
A few with specific problem experience24%21%
 311 Source: Lakhani and von Hippel 2003, table 10. 312 Even in the unlikely event that a secret is held by one individual, that information holder will not find it easy to keep a secret for long. Mansfield (1985) studied 100 American firms and found that "information concerning development decisions is generally in the hands of rivals within about 12 to 18 months, on the average, and information concerning the detailed nature and operation of a new product or process generally leaks out within about a year." This observation is supported by Allen's previously mentioned study of free revealing in the nineteenth-century English iron industry. Allen (1983, p. 17) notes that developers of improved blast furnace designs were unlikely to be able to keep their valuable innovations secret because "in the case of blast furnaces and steelworks, the construction would have been done by contractors who would know the design." Also, "the designs themselves were often created by consulting engineers who shifted from firm to firm." 313 Low Ability to Profit from Patenting 314 Next, suppose that a single user-innovator is the only holder of a particular unit of innovation-related information, and that for some reason there are no easy substitutes. That user actually does have a real choice with respect to disposing of its intellectual property: it can keep the innovation secret and profit from in-house use only, it can license it, or it can choose to freely reveal the innovation. We have just seen that the practical likelihood of keeping a secret is low, especially when there are multiple potential providers of very similar secrets. But if one legally protects an innovation by means of a patent or a copyright, one need not keep an innovation secret in order to control it. Thus, a firm or an individual that freely reveals is forgoing any chance to get a profit via licensing of intellectual property for a fee. What, in practical terms, is the likelihood of succeeding at this and so of forgoing profit by choosing to freely reveal? 315 In most subject matters, the relevant form of legal protection for intellectual property is the patent, generally the "utility" patent. (The notable exception is the software industry, where material to be licensed is often protected by copyright.) In the United States, utility patents may be granted for inventions related to composition of matter and/or a method and/or a use. They may not be granted for ideas per se, mathematical formulas, laws of nature, and anything repugnant to morals and public policy. Within subject matters potentially protectable by patent, protection will be granted only when the intellectual property claimed meets additional criteria of usefulness, novelty, and non-obviousness to those skilled in the relevant art. (The tests for whether these criteria have been met are based on judgement. When a low threshold is used, patents are easier to get, and vice-versa (Hall and Harhoff 2004).) 316 The real-world value of patent protection has been studied for more than 40 years. Various researchers have found that, with a few exceptions, innovators do not think that patents are very useful either for excluding imitators or for capturing royalties in most industries. (Fields generally cited as exceptions are pharmaceuticals, chemicals, and chemical processes, where patents do enable markets for technical information (Arora et al. 2001).) Most respondents also say that the availability of patent protection does not induce them to invest more in research and development than they would if patent protection did not exist. Taylor and Silberston (1973) reported that 24 of 32 firms said that only 5 percent or less of their R&D expenditures were dependent on the availability of patent protection. Levin et al. (1987) surveyed 650 R&D executives in 130 different industries and found that all except respondents from the chemical and pharmaceutical industries judged patents to be "relatively ineffective." Similar findings have been reported by Mansfield (1968, 1985), by Cohen et al. (2000, 2002), by Arundel (2001), and by Sattler (2003). 317 Despite recent governmental efforts to strengthen patent enforcement, a comparison of survey results indicates only a modest increase between 1983 and 1994 in large firms' evaluations of patents' effectiveness in protecting innovations or promoting innovation investments. Of course, there are notable exceptions: some firms, including IBM and TI, report significant income from the licensing of their patented technologies. 318 Obtaining a patent typically costs thousands of dollars, and it can take years (Harhoff, Henkel, and von Hippel 2003). This makes patents especially impractical for many individual user-innovators, and also for small and medium-size firms of limited means. As a stark example, it is hard to imagine that an individual user who has developed an innovation in sports equipment would find it appealing to invest in a patent and in follow-on efforts to find a licensee and enforce payment. The few that do attempt this, as Shah (2000) has shown, seldom gain any return from licensees as payment for their time and expenditures. 319 Copyright is a low-cost and immediate form of legal protection that applies to original writings and images ranging from software code to movies. Authors do not have to apply for copyright protection; it "follows the author's pen across the page." Licensing of copyrighted works is common, and it is widely practiced by commercial software firms. When one buys a copy of a non-custom software product, one is typically buying only a license to use the software, not buying the intellectual property itself. However, copyright protection is also limited in an important way. Only the specific original writing itself is protected, not the underlying invention or ideas. As a consequence, copyright protections can be circumvented. For example, those who wish to imitate the function of a copyrighted software program can do so by writing new software code to implement that function. 320 Given the above, we may conclude that in practice little profit is being sacrificed by many user-innovator firms or individuals that choose to forgo the possibility of legally protecting their innovations in favor of free revealing. 321 Positive Incentives for Free Revealing 322 As was noted earlier, when we say that an innovator "freely reveals" proprietary information we mean that all existing and potential intellectual property rights to that information are voluntarily given up by that innovator and that all interested parties are given access to it---the information becomes a public good. These conditions can often be met at a very low cost. For example, an innovator can simply post information about the innovation on a website without publicity, so those potentially interested must discover it. Or a firm that has developed a novel process machine can agree to give a factory tour to any firm or individual that thinks to ask for one, without attempting to publicize the invention or the availability of such tours in any way. However, it is clear that many innovators go beyond basic, low-cost forms of free revealing. They spend significant money and time to ensure that their innovations are seen in a favorable light, and that information about them is effectively and widely diffused. Writers of computer code may work hard to eliminate all bugs and to document their code in a way that is very easy for potential adopters to understand before freely revealing it. Plant owners may repaint their plant, announce the availability of tours at a general industry meeting, and then provide a free lunch for their visitors. 323 Innovators' active efforts to diffuse information about their innovations suggest that there are positive, private rewards to be obtained from free revealing. A number of authors have considered what these might be. Allen (1983) proposed that reputation gained for a firm or for its managers might offset a reduction in profits for the firm caused by free revealing. Raymond (1999) and Lerner and Tirole (2002) elaborated on this idea when explaining free revealing by contributors to open source software development projects. Free revealing of high-quality code, they noted, can increase a programmer's reputation with his peers. This benefit can lead to other benefits, such as an increase in the programmer's value on the job market. Allen has argued that free revealing might have effects that actually increase a firm's profits if the revealed innovation is to some degree specific to assets owned by the innovator (see also Hirschleifer 1971). 324 Free revealing may also increase an innovator's profit in other ways. When an innovating user freely reveals an innovation, the direct result is to increase the diffusion of that innovation relative to what it would be if the innovation were either licensed at a fee or held secret. The innovating user may then benefit from the increase in diffusion via a number of effects. Among these are network effects. (The classic illustration of a network effect is that the value of each telephone goes up as more are sold, because the value of a phone is strongly affected by the number of others who can be contacted in the network.) In addition, and very importantly, an innovation that is freely revealed and adopted by others can become an informal standard that may preempt the development and/or commercialization of other versions of the innovation. If, as Allen suggested, the innovation that is revealed is designed in a way that is especially appropriate to conditions unique to the innovator, this can result in creating a permanent source of advantage for that innovator. 325 Being first to reveal a certain type of innovation increases a user firm's chances of having its innovation widely adopted, other things being equal. This may induce innovators to race to reveal first. Firms engaged in a patent race may disclose information voluntarily if the profits from success do not go only to the winner of the race. If being second quickly is preferable to being first relatively late, there will be an incentive for voluntary revealing in order to accelerate the race (de Fraja 1993). 326 Incentives to freely reveal have been most deeply explored in the specific case of open source software projects. Students of the open source software development process report that innovating users have a number of motives for freely revealing their code to open source project managers and open source code users in general. If they freely reveal, others can debug and improve upon the modules they have contributed, to everyone's benefit. They are also motivated to have their improvement incorporated into the standard version of the open source software that is generally distributed by the volunteer open source user organization, because it will then be updated and maintained without further effort on the innovator's part. This volunteer organization is the functional equivalent of a manufacturer with respect to inducing manufacturer improvements, because a user-developed improvement will be assured of inclusion in new "official" software releases only if it is approved and adopted by the coordinating user group. Innovating users also report being motivated to freely reveal their code under a free or open source license by a number of additional factors. These include giving support to open code and "giving back" to those whose freely revealed code has been of value to them (Lakhani and Wolf 2005). 327 By freely revealing information about an innovative product or process, a user makes it possible for manufacturers to learn about that innovation. Manufacturers may then improve upon it and/or offer it at a price lower than users' in-house production costs (Harhoff et al. 2003). When the improved version is offered for sale to the general market, the original user-innovator (and other users) can buy it and gain from in-house use of the improvements. For example, consider that manufacturers often convert user-developed innovations ("home-builts") into a much more robust and reliable form when preparing them for sale on the commercial market. Also, manufacturers offer related services, such as field maintenance and repair programs, that innovating users must otherwise provide for themselves. 328 A variation of this argument applies to the free revealing among competing manufacturers documented by Henkel (2003). Competing developers of embedded Linux systems were creating software that was specifically designed to run the hardware products of their specific clients. Each manufacturer could freely reveal this equipment-specific code without fear of direct competitive repercussions: it was applicable mainly to specific products made by a manufacturer's client, and it was less valuable to others. At the same time, all would jointly benefit from free revealing of improvements to the underlying embedded Linux code base, upon which they all build their proprietary products. After all, the competitive advantages of all their products depended on this code base's being equal to or better than the proprietary software code used by other manufacturers of similar products. Additionally, Linux software was a complement to hardware that many of the manufacturers in Henkel's sample also sold. Improved Linux software would likely increase sales of their complementary hardware products. (Complement suppliers' incentives to innovate have been modeled by Harhoff (1996).) 329 Free Revealing and Reuse 330 Of course, free revealing is of value only if others (re)use what has been revealed. It can be difficult to track what visitors to an information commons take away and reuse, and there is as yet very little empirical information on this important matter. Valuable forms of reuse range from the gaining of general ideas of development paths to pursue or avoid to the adoption of specific designs. For example, those who download software code from an open source project repository can use it to learn about approaches to solving a particular software problem and/or they may reuse portions of the downloaded code by inserting it directly into a software program of their own. Von Krogh et al. (2004) studied the latter type of code reuse in open source software and found it very extensive. Indeed, they report that most of the lines of software code in the projects they studied were taken from the commons of other open source software projects and software libraries and reused. 331 In the case of academic publications, we see evidence that free revealing does increase reuse---a matter of great importance to academics. A citation is an indicator that information contained in an article has been reused: the article has been read by the citing author and found useful enough to draw to readers' attention. Recent empirical studies are finding that articles to which readers have open access---articles available for free download from an author's website, for example---are cited significantly more often than are equivalent articles that are available only from libraries or from publishers' fee-based websites. Antelman (2004) finds an increase in citations ranging from 45 percent in philosophy to 91 percent in mathematics. She notes that "scholars in diverse disciplines are adopting open-access practices at a surprisingly high rate and are being rewarded for it, as reflected in [citations]." 332 Implications for Theory 333 We have seen that in practice free revealing may often be the best practical course of action for innovators. How can we tie these observations back to theory, and perhaps improve theory as a result? At present there are two major models that characterize how innovation gets rewarded. The private investment model is based on the assumption that innovation will be supported by private investors expecting to make a profit. To encourage private investment in innovation, society grants innovators some limited rights to the innovations they generate via patents, copyrights, and trade secrecy laws. These rights are intended to assist innovators in getting private returns from their innovation-related investments. At the same time, the monopoly control that society grants to innovators and the private profits they reap create a loss to society relative to the free and unfettered use by all of the knowledge that the innovators have created. Society elects to suffer this social loss in order to increase innovators' incentives to invest in the creation of new knowledge (Arrow 1962; Dam 1995). 334 The second major model for inducing innovation is termed the collective action model. It applies to the provision of public goods, where a public good is defined by its non-excludability and non-rivalry: if any user consumes it, it cannot be feasibly withheld from other users, and all consume it on the same terms (Olson 1967). The collective action model assumes that innovators are required to relinquish control of knowledge or other assets they have developed to a project and so make them a public good. This requirement enables collective action projects to avoid the social loss associated with the restricted access to knowledge of the private investment model. At the same time, it creates problems with respect to recruiting and motivating potential contributors. Since contributions to a collective action project are a public good, users of that good have the option of waiting for others to contribute and then free riding on what they have done (Olson 1967). 335 The literature on collective action deals with the problem of recruiting contributors to a task in a number of ways. Oliver and Marwell (1988) and Taylor and Singleton (1993) predict that the description of a project's goals and the nature of recruiting efforts should matter a great deal. Other researchers argue that the creation and deployment of selective incentives for contributors is essential to the success of collective action projects. For example, projects may grant special credentials to especially productive project members (Friedman and McAdam 1992; Oliver 1980). The importance of selective incentives suggests that small groups will be most successful at executing collective action projects. In small groups, selective incentives can be carefully tailored for each group member and individual contributions can be more effectively monitored (Olson 1967; Ostrom 1998). 336 Interestingly, successful open source software projects do not appear to follow any of the guidelines for successful collective action projects just described. With respect to project recruitment, goal statements provided by successful open source software projects vary from technical and narrow to ideological and broad, and from precise to vague and emergent (for examples, see goal statements posted by projects hosted on Sourceforge.net).8 Further, such projects may engage in no active recruiting beyond simply posting their intended goals and access address on a general public website customarily used for this purpose (for examples, see the Freshmeat.net website). Also, projects have shown by example that they can be successful even if large groups---perhaps thousands---of contributors are involved. Finally, open source software projects seem to expend no effort to discourage free riding. Anyone is free to download code or seek help from project websites, and no apparent form of moral pressure is applied to make a compensating contribution (e.g., "If you benefit from this code, please also contribute . . ."). 8 As a specific example of a project with an emergent goal, consider the beginnings of the Linux open source software project. In 1991, Linus Torvalds, a student in Finland, wanted a Unix operating system that could be run on his PC, which was equipped with a 386 processor. Minix was the only software available at that time but it was commercial, closed source, and it traded at US$150. Torvalds found this too expensive, and started development of a Posix-compatible operating system, later known as Linux. Torvalds did not immediately publicize a very broad and ambitious goal, nor did he attempt to recruit contributors. He simply expressed his private motivation in a message he posted on July 3, 1991, to the USENET newsgroup comp.os.minix (Wayner 2000): Hello netlanders, Due to a project I'm working on (in minix), I'm interested in the posix standard definition. [Posix is a standard for UNIX designers. A software using POSIX is compatible with other UNIX-based software.] Could somebody please point me to a (preferably) machine-readable format of the latest posix-rules? Ftp-sites would be nice. In response, Torvalds got several return messages with Posix rules and people expressing a general interest in the project. By the early 1992, several skilled programmers contributed to Linux and the number of users increased by the day. Today, Linux is the largest open source development project extant in terms of number of developers. 337 What can explain these deviations from expected practice? What, in other words, can explain free revealing of privately funded innovations and enthusiastic participation in projects to produce a public good? From the theoretical perspective, Georg von Krogh and I think the answer involves revisiting and easing some of the basic assumptions and constraints conventionally applied to the private investment and collective action models of innovation. Both, in an effort to offer "clean" and simple models for research, have excluded from consideration a very rich and fertile middle ground where incentives for private investment and collective action can coexist, and where a "private-collective" innovation model can flourish. More specifically, a private-collective model of innovation occupies the middle ground between the private investment model and the collective action model by: 338 Eliminating the assumption in private investment models that free revealing of innovations developed with private funds will represent a loss of private profit for the innovator and so will not be engaged in voluntarily. Instead the private-collective model proposes that under common conditions free revealing of proprietary innovations may increase rather than decrease innovators' private profit. 339 Eliminating the assumption in collective action models that a free rider obtains benefits from the completed public good that are equal to those a contributor obtains. Instead, the private-collective model proposes that contributors to a public good can inherently obtain greater private benefits than free riders. These provide incentives for participation in collective action projects that need not be managed by project personnel (von Hippel and von Krogh 2003). 340 In summation: Innovations developed at private cost are often revealed freely, and this behavior makes economic sense for participants under commonly encountered conditions. A private-collective model of innovation incentives can explain why and when knowledge created by private funding may be offered freely to all. When the conditions are met, society appears to have the best of both worlds---new knowledge is created by private funding and then freely revealed to all. 341 7 Innovation Communities 342 It is now clear that users often innovate, and that they often freely reveal their innovations. But what about informal cooperation among users? What about organized cooperation in development of innovations and other matters? The answer is that both flourish among user-innovators. Informal user-to-user cooperation, such as assisting others to innovate, is common. Organized cooperation in which users interact within communities, is also common. Innovation communities are often stocked with useful tools and infrastructure that increase the speed and effectiveness with which users can develop and test and diffuse their innovations. 343 In this chapter, I first show that user innovation is a widely distributed process and so can be usefully drawn together by innovation communities. I next explore the valuable functions such communities can provide. I illustrate with a discussion of free and open source software projects, a very successful form of innovation community in the field of software development. Finally, I point out that innovation communities are by no means restricted to the development of information products such as software, and illustrate with the case of a user innovation community specializing in the development of techniques and equipment used in the sport of kitesurfing. 344 User Innovation Is Widely Distributed 345 When users' needs are heterogeneous and when the information drawn on by innovators is sticky, it is likely that product-development activities will be widely distributed among users, rather than produced by just a few prolific user-innovators. It should also be the case that different users will tend to develop different innovations. As was shown in chapter 5, individual users and user firms tend to develop innovations that serve their particular needs, and that fall within their individual "low-cost innovation niches." For example, a mountain biker who specializes in jumping from high platforms and who is also an orthopedic surgeon will tend to develop innovations that draw on both of these types of information: he might create a seat suspension that reduces shock to bikers' spines upon landing from a jump. Another mountain biker specializing in the same activity but with a different background---say aeronautical engineering---is likely to draw on this different information to come up with a different innovation. From the perspective of Fleming (2001), who has studied innovations as consisting of novel combinations of pre-existing elements, such innovators are using their membership in two distinct communities to combine previously disparate elements. Baldwin and Clark (2003) and Henkel (2004a) explore this type of situation in theoretical terms. 346 The underlying logic echoes that offered by Eric Raymond regarding "Linus's Law" in software debugging. In software, discovering and repairing subtle code errors or bugs can be very costly (Brooks 1979). However, Raymond argued, the same task can be greatly reduced in cost and also made faster and more effective when it is opened up to a large community of software users that each may have the information needed to identify and fix some bugs. Under these conditions, Raymond says, "given a large enough beta tester and co-developer base, almost every problem will be characterized quickly and the fix obvious to someone. Or, less formally, `given enough eyeballs, all bugs are shallow."' He explains: "More users find more bugs because adding more users adds more ways of stressing the program. . . . Each [user] approaches the task of bug characterization with a slightly different perceptual set and analytical toolkit, a different angle on the problem. So adding more beta-testers . . . increases the probability that someone's toolkit will be matched to the problem in such a way that the bug is shallow to that person." (1999, pp. 41--44) 347 The analogy to distributed user innovation is, of course, that each user has a different set of innovation-related needs and other assets in place which makes a particular type of innovation low-cost ("shallow") to that user. The assets of some user will then generally be found to be a just-right fit to many innovation development problems. (Note that this argument does not mean that all innovations will be cheaply done by users, or even done by users at all. In essence, users will find it cheaper to innovate when manufacturers' economies of scale with respect to product development are more than offset by the greater scope of innovation assets held by the collectivity of individual users.) 348 Available data support these expectations. In chapter 2 we saw evidence that users tended to develop very different innovations. To test whether commercially important innovations are developed by just a few users or by many, I turn to studies documenting the functional sources of important innovations later commercialized. As is evident in table 7.1, most of the important innovations attributed to users in these studies were done by different users. In other words, user innovation does tend to be widely distributed in a world characterized by users with heterogeneous needs and heterogeneous stocks of sticky information. 349 Table 7.1 User innovation is widely distributed, with few users developing more than one major innovation. NA: data not available. 350 Number of users developing this number of major innovations 351
1236NASample (n)
Scientific Instrumentsa28010132
Scientific Instrumentsb20101028
Process equipmentc19100829
Sports equipmentd700007
 352 a. Source: von Hippel 1988, appendix: GC, TEM, NMR Innovations.
b. Source: Riggs and von Hippel, Esca and AES.
c. Source: von Hippel 1988, appendix: Semiconductor and pultrusion process equipment innovations.
d. Source: Shah 2000, appendix A: skateboarding, snowboarding, and windsurfing innovations. 353 Innovation Communities 354 User-innovators may be generally willing to freely reveal their information. However, as we have seen, they may be widely distributed and each may have only one or a few innovations to offer. The practical value of the "freely revealed innovation commons" these users collectively offer will be increased if their information is somehow made conveniently accessible. This is one of the important functions of "innovation communities." 355 I define "innovation communities" as meaning nodes consisting of individuals or firms interconnected by information transfer links which may involve face-to-face, electronic, or other communication. These can, but need not, exist within the boundaries of a membership group. They often do, but need not, incorporate the qualities of communities for participants, where "communities" is defined as meaning"networks of interpersonal ties that provide sociability, support, information, a sense of belonging, and social identity" (Wellman et al. 2002, p. 4).9 9 When they do not incorporate these qualities, they would be more properly referred to as networks---but communities is the term commonly used, and I follow that practice here. 356 Innovation communities can have users and/or manufacturers as members and contributors. They can flourish when at least some innovate and voluntarily reveal their innovations, and when others find the information revealed to be of interest. In previous chapters, we saw that these conditions do commonly exist with respect to user-developed innovations: users innovate in many fields, users often freely reveal, and the information revealed is often used by manufacturers to create commercial products---a clear indication many users, too, find this information of interest. 357 Innovation communities are often specialized, serving as collection points and repositories for information related to narrow categories of innovations. They may consist only of information repositories or directories in the form of physical or virtual publications. For example, userinnovation.mit.edu is a specialized website where researchers can post articles on their findings and ideas related to innovation by users. Contributors and non-contributors can freely access and browse the site as a convenient way to find such information. 358 Innovation communities also can offer additional important functions to participants. Chat rooms and email lists with public postings can be provided so that contributors can exchange ideas and provide mutual assistance. Tools to help users develop, evaluate, and integrate their work can also be provided to community members---and such tools are often developed by community members themselves. 359 All the community functionality just mentioned and more is visible in communities that develop free and open source software programs. The emergence of this particular type of innovation community has also done a great deal to bring the general phenomenon to academic and public notice, and so I will describe them in some detail. I first discuss the history and nature of free and open source software itself (the product). Next I outline key characteristics of the free and open source software development projects typically used to create and maintain such software (the community-based development process). 360 Open Source Software 361 In the early days of computer programming, commercial "packaged" software was a rarity---if you wanted a particular program for a particular purpose, you typically wrote the code yourself or hired someone to write it for you. Much of the software of the 1960s and the 1970s was developed in academic and corporate laboratories by scientists and engineers. These individuals found it a normal part of their research culture to freely give and exchange software they had written, to modify and build on one another's software, and to freely share their modifications. This communal behavior became a central feature of "hacker culture." (In communities of open source programmers, "hacker" is a positive term that is applied to talented and dedicated programmers.10 ) 10 hacker n. [originally, someone who makes furniture with an axe] 1. A person who enjoys exploring the details of programmable systems and how to stretch their capabilities, as opposed to most users, who prefer to learn only the minimum necessary. 2. One who programs enthusiastically (even obsessively) or who enjoys programming rather than just theorizing about programming. 3. A person capable of appreciating hack value. 4. A person who is good at programming quickly. . . . 8. [deprecated] A malicious meddler who tries to discover sensitive information by poking around. Hence password hacker, network hacker. The correct term for this sense is cracker (Raymond 1996). 362 In 1969, the Defense Advanced Research Projects Agency, a part of the US Department of Defense, established the ARPANET, the first transcontinental high-speed computer network. This network eventually grew to link hundreds of universities, defense contractors, and research laboratories. Later succeeded by the Internet, it also allowed hackers to exchange software code and other information widely, easily, and cheaply---and also enabled them to spread hacker norms of behavior. 363 The communal hacker culture was very strongly present among a group of programmers---software hackers---housed at MIT's Artificial Intelligence Laboratory in the 1960s and the 1970s (Levy 1984). In the 1980s this group received a major jolt when MIT licensed some of the code created by its hacker employees to a commercial firm. This firm, in accordance with normal commercial practice, then promptly restricted access to the "source code"11 of that software, and so prevented non-company personnel---including the MIT hackers who had been instrumental in developing it---from continuing to use it as a platform for further learning and development. 11 Source code is a sequence of instructions to be executed by a computer to accomplish a program's purpose. Programmers write computer software in the form of source code, and also document that source code with brief written explanations of the purpose and design of each section of their program. To convert a program into a form that can actually operate a computer, source code is translated into machine code using a software tool called a compiler. The compiling process removes program documentation and creates a binary version of the program---a sequence of computer instructions consisting only of strings of ones and zeros. Binary code is very difficult for programmers to read and interpret. Therefore, programmers or firms that wish to prevent others from understanding and modifying their code will release only binary versions of the software. In contrast, programmers or firms that wish to enable others to understand and update and modify their software will provide them with its source code. (Moerke 2000, Simon 1996). 364 Richard Stallman, a brilliant programmer in MIT's Artificial Intelligence Laboratory, was especially distressed by the loss of access to communally developed source code. He also was offended by a general trend in the software world toward development of proprietary software packages and the release of software in forms that could not be studied or modified by others. Stallman viewed these practices as morally wrong impingements on the rights of software users to freely learn and create. In 1985, in response, he founded the Free Software Foundation and set about to develop and diffuse a legal mechanism that could preserve free access for all to the software developed by software hackers. Stallman's pioneering idea was to use the existing mechanism of copyright law to this end. Software authors interested in preserving the status of their software as "free" software could use their own copyright to grant licenses on terms that would guarantee a number of rights to all future users. They could do this by simply affixing a standard license to their software that conveyed these rights. The basic license developed by Stallman to implement this seminal idea was the General Public License or GPL (sometimes referred to as copyleft, in a play on the word "copyright"). Basic rights transferred to those possessing a copy of free software include the right to use it at no cost, the right to study its source code, the right to modify it, and the right to distribute modified or unmodified versions to others at no cost. Licenses conveying similar rights were developed by others, and a number of such licenses are currently used in the open source field. Free and open source software licenses do not grant users the full rights associated with free revealing as that term was defined earlier. Those who obtain the software under a license such as the GPL are restricted from certain practices. For example, they cannot incorporate GPL software into proprietary software that they then sell.12 Indeed, contributors of code to open source software projects are very concerned with enforcing such restrictions in order to ensure that their code remains accessible to all (O'Mahony 2003). 12 See www.gnu.org/licenses/licenses.html#GPL 365 The idea of free software did not immediately become mainstream, and industry was especially suspicious of it. In 1998, Bruce Perens and Eric Raymond agreed that a significant part of the problem resided in Stallman's term "free" software, which might understandably have an ominous ring to the ears of businesspeople. Accordingly, they, along with other prominent hackers, founded the open source software movement (Perens 1999). Open source software uses the licensing practices pioneered by the free software movement. It differs from that movement primarily on philosophical grounds, preferring to emphasize the practical benefits of its licensing practices over issues regarding the moral importance of granting users the freedoms offered by both free and open source software. The term "open source" is now generally used by both practitioners and scholars to refer to free or open source software, and that is the term I use in this book. 366 Open source software has emerged as a major cultural and economic phenomenon. The number of open source software projects has been growing rapidly. In mid 2004, a single major infrastructure provider and repository for open source software projects, Sourceforge.net,13 hosted 83,000 projects and had more than 870,000 registered users. A significant amount of software developed by commercial firms is also being released under open source licenses. 13 <http://www.sourceforge.net> 367 Open Source Software Development Projects 368 Software can be termed "open source" independent of how or by whom it has been developed: the term denotes only the type of license under which it is made available. However, the fact that open source software is freely accessible to all has created some typical open source software development practices that differ greatly from commercial software development models---and that look very much like the "hacker culture" behaviors described above. 369 Because commercial software vendors typically wish to sell the code they develop, they sharply restrict access to the source code of their software products to firm employees and contractors. The consequence of this restriction is that only insiders have the information required to modify and improve that proprietary code further (Meyer and Lopez 1995; Young, Smith, and Grimm 1996; Conner and Prahalad 1996). In sharp contrast, all are offered free access to the source code of open source software if that code is distributed by its authors. In early hacker days, this freedom to learn and use and modify software was exercised by informal sharing and co-development of code---often by the physical sharing and exchange of computer tapes and disks on which the code was recorded. In current Internet days, rapid technological advances in computer hardware and software and networking technologies have made it much easier to create and sustain a communal development style on ever-larger scales. Also, implementing new projects is becoming progressively easier as effective project design becomes better understood, and as prepackaged infrastructural support for such projects becomes available on the Web. 370 Today, an open source software development project is typically initiated by an individual or a small group seeking a solution to an individual's or a firm's need. Raymond (1999, p. 32) suggests that "every good work of software starts by scratching a developer's personal itch" and that "too often software developers spend their days grinding away for pay at programs they neither need nor love. But not in the (open source) world. . . ." A project's initiators also generally become the project's "owners" or "maintainers" who take on responsibility for project management.14 Early on, this individual or group generally develops a first, rough version of the code that outlines the functionality envisioned. The source code for this initial version is then made freely available to all via downloading from an Internet website established by the project. The project founders also set up infrastructure for the project that those interested in using or further developing the code can use to seek help, provide information or provide new open source code for others to discuss and test. In the case of projects that are successful in attracting interest, others do download and use and "play with" the code---and some of these do go on to create new and modified code. Most then post what they have done on the project website for use and critique by any who are interested. New and modified code that is deemed to be of sufficient quality and of general interest by the project maintainers is then added to the authorized version of the code. In many projects the privilege of adding to the authorized code is restricted to only a few trusted developers. These few then serve as gatekeepers for code written by contributors who do not have such access (von Krogh and Spaeth 2002). 14 "The owner(s) [or `maintainers'] of an open source software project are those who have the exclusive right, recognized by the community at large, to redistribute modified versions. . . . According to standard open source licenses, all parties are equal in the evolutionary game. But in practice there is a very well-recognized distinction between `official' patches [changes to the software], approved and integrated into the evolving software by the publicly recognized maintainers, and `rogue' patches by third parties. Rogue patches are unusual and generally not trusted." (Raymond 1999, p. 89) 371 Critical tools and infrastructure available to open source software project participants includes email lists for specialized purposes that are open to all. Thus, there is a list where code users can report software failures ("bugs") that they encounter during field use of the software. There is also a list where those developing the code can share ideas about what would be good next steps for the project, good features to add, etc. All of these lists are open to all and are also publicly archived, so anyone can go back and learn what opinions were and are on a particular topic. Also, programmers contributing to open source software projects tend to have essential tools, such as specific software languages, in common. These are generally not specific to a single project, but are available on the web. Basic toolkits held in common by all contributors tends to greatly ease interactions. Also, open source software projects have version-control software that allows contributors to insert new code contributions into the existing project code base and test them to see if the new code causes malfunctions in existing code. If so, the tool allows easy reversion to the status quo ante. This makes "try it and see" testing much more practical, because much less is at risk if a new contribution inadvertently breaks the code. Toolkits used in open source projects have been evolved through practice and are steadily being improved by user-innovators. Individual projects can now start up using standard infrastructure sets offered by sites such as Sourceforge.net. 372 Two brief case histories will help to further convey the flavor of open source software development. 373 Apache Web Server Software 374 Apache web server software is used on web server computers that host web pages and provide appropriate content as requested by Internet browsers. Such 7 computers are a key element of the Internet-based World Wide Web infrastructure. 375 The web server software that evolved into Apache was developed by University of Illinois undergraduate Rob McCool for, and while working at, the National Center for Supercomputing Applications (NCSA). The source code as developed and periodically modified by McCool was posted on the web so that users at other sites could download it, use it, modify it, and develop it further. When McCool departed NCSA in mid 1994, a small group of webmasters who had adopted his web server software for their own sites decided to take on the task of continued development. A core group of eight users gathered all documentation and bug fixes and issued a consolidated patch. This "patchy" web server software evolved over time into Apache. Extensive user feedback and modification yielded Apache 1.0, released on December 1, 1995. 376 In 4 years, after many modifications and improvements contributed by many users, Apache became the most popular web server software on the Internet, garnering many industry awards for excellence. Despite strong competition from commercial software developers such as Microsoft and Netscape, it is currently used by over 60 percent of the world's millions of websites. Modification and updating of Apache by users and others continues, with the release of new versions being coordinated by a central group of 22 volunteers. 377 Fetchmail---An Internet Email Utility Program 378 Fetchmail is an Internet email utility program that "fetches" email from central servers to a local computer. The open source project to develop, maintain, and improve this program was led by Eric Raymond (1999). 379 Raymond first began to puzzle about the email delivery problem in 1993 because he was personally dissatisfied with then-existing solutions. "What I wanted," Raymond recalled (1999, p. 31), "was for my mail to be delivered on snark, my home system, so that I would be notified when it arrived and could handle it using all my local tools." Raymond decided to try and develop a better solution. He began by searching databases in the open source world for an existing, well-coded utility that he could use as a development base. He knew it would be efficient to build on others' related work if possible, and in the world of open source software (then generally called free software) this practice is understood and valued. Raymond explored several candidate open source programs, and settled on one in small-scale use called "popclient." He developed a number of improvements to the program and proposed them to the then maintainer of popclient. It turned out that this individual had lost interest in working further on the program, and so his response to Raymond's suggestions was to offer his role to Raymond so that he could evolve the popclient further as he chose. 380 Raymond accepted the role of popclient's maintainer, and over the next months he improved the program significantly in conjunction with advice and suggestions from other users. He carefully cultivated his more active beta list of popclient users by regularly communicating with them via messages posted on an public electronic bulletin board set up for that purpose. Many responded by volunteering information on bugs they had found and perhaps fixed, and by offering improvements they had developed for their own use. The quality of these suggestions was often high because "contributions are received not from a random sample, but from people who are interested enough to use the software, learn about how it works, attempt to find solutions to the problems they encounter, and actually produce an apparently reasonable fix. Anyone who passes all these filters is highly likely to have something useful to contribute." (ibid., p. 42) 381 Eventually, Raymond arrived at an innovative design that he knew worked well because he and his beta list of co-developers had used it, tested it and improved it every day. Popclient (now renamed fetchmail) became standard software used by millions users. Raymond continues to lead the group of volunteers that maintain and improve the software as new user needs and conditions dictate. 382 Development of Physical Products by Innovation Communities 383 User innovation communities are by no means restricted to the development of information products like software. They also are active in the development of physical products, and in very similar ways. Just as in the case of communities devoted to information product, communities devoted to physical products can range from simple information exchange sites to sites well furnished with tools and infrastructure. Within sports, Franke and Shah's study illustrates relatively simple community infrastructure. Thus, the boardercross community they studied consisted of semi-professional athletes from all over the world who meet in up to 10 competitions a year in Europe, North America, and Japan. Franke and Shah report that community members knew one another well, and spent a considerable amount of time together. They also assisted one another in developing and modifying equipment for their sport. However, the community had no specialized sets of tools to support joint innovation development. 384 More complex communities devoted to the development of physical products often look similar to open source software development communities in terms of tools and infrastructure. As an example, consider the recent formation of a community dedicated to the development and diffusion of information regarding novel kitesurfing equipment. Kitesurfing is a water sport in which the user stands on a special board, somewhat like a surfboard, and is pulled along by holding onto a large, steerable kite. Equipment and technique have evolved to the point that kites can be guided both with and against the wind by a skilled kitesurfer, and can lift rider and board many meters into the air for tens of seconds at a time. 385 Designing kites for kitesurfing is a sophisticated undertaking, involving low-speed aerodynamical considerations that are not yet well understood. Early kites for kitesurfing were developed and built by user-enthusiasts who were inventing both kitesurfing techniques and kitesurfing equipment interdependently. In about 2001, Saul Griffith, an MIT PhD student with a long-time interest in kitesurfing and kite development, decided that kite-surfing would benefit from better online community interaction. Accordingly, he created a site for the worldwide community of user-innovators in kitesurfing (www.zeroprestige.com). Griffith began by posting patterns for kites he had designed on the site and added helpful hints and tools for kite construction and use. Others were invited to download this information for free and to contribute their own if they wished. Soon other innovators started to post their own kite designs, improved construction advice for novices, and sophisticated design tools such as aerodynamics modeling software and rapid prototyping software. Some kitesurfers contributing innovations to the site had top-level technical skills; at least one was a skilled aerodynamicist employed by an aerospace firm. 386 Note that physical products are information products during the design stage. In earlier days, information about an evolving design was encoded on large sheets of paper, called blueprints, that could be copied and shared. The information on blueprints could be understood and assessed by fellow designers, and could also be used by machinists to create the actual physical products represented. Today, designs for new products are commonly encoded in computer-aided design (CAD) files. These files can be created and seen as two-dimensional and three-dimensional renderings by designers. The designs they contain can also be subjected to automated analysis by various engineering tools to determine, for example, whether they can stand up to stresses to which they will be subjected. CAD files can then be downloaded to computer-controlled fabrication machinery that will actually build the component parts of the design. 387 The example of the kitesurfing group's methods of sharing design information illustrates the close relationship between information and physical products. Initially, users in the group exchanged design ideas by means of simple sketches transferred over the Internet. Then group members learned that computerized cutters used by sail lofts to cut sails from large pieces of cloth are suited to cutting cloth for surfing kites. They also learned that sail lofts were interested in their business. Accordingly, innovation group members began to exchange designs in the form of CAD files compatible with sail lofts' cutting equipment. When a user was satisfied with a design, he would transmit the CAD file to a local sail loft for cutting. The pieces were then sewn together by the user or sent to a sewing facility for assembly. The total time required to convert an information product into a physical one was less than a week, and the total cost of a finished kite made in this way was a few hundred dollars---much less than the price of a commercial kite. 388 User-to-User Assistance 389 Clearly, user innovation communities can offer sophisticated support to individual innovators in the form of tools. Users in these innovation communities also tend to behave in a collaborative manner. That is, users not only distribute and evaluate completed innovations; they also volunteer other important services, such as assisting one another in developing and applying innovations. 390 Franke and Shah (2003) studied the frequency with which users in four sporting communities assisted one another with innovations, and found that such assistance was very common (table 7.2). They also found that those who assisted were significantly more likely to be innovators themselves (table 7.3). The level of satisfaction reported by those assisted was very high. Seventy-nine percent agreed strongly with the statement "If I had a similar problem I would ask the same people again." Jeppesen (2005) similarly found extensive user-to-user help being volunteered in the field of computer gaming. 391 Table 7.2 Number of people from whom innovators received assistance. 392
Number of peopleNumber of casesPercentage
000
136
21426
3--52547
6--10815
> 1036
Total53100
 393 Source: Franke and Shah 2003, table 4. 394 Table 7.3 Innovators tended to be the ones assisting others with their innovations (p < 0.0001). 395
InnovatorsNon-innovatorsTotal
Gave assistance281341
Did not give assistance32115147
Total60128
 396 Source: Franke and Shah 2003, table 7. 397 Such helping activity is clearly important to the value contributed by innovation communities to community participants. Why people might voluntarily offer assistance is a subject of analysis. The answers are not fully in, but the mysteries lessen as the research progresses. An answer that appears to be emerging is that there are private benefits to assistance providers, just as there are for those who freely reveal innovations (Lakhani and von Hippel 2003). In other words, provision of free assistance may be explicable in terms of the private-collective model of innovation-related incentives discussed earlier. 398 8 Adapting Policy to User Innovation 399 Government policy makers generally wish to encourage activities that increase social welfare, and to discourage activities that reduce it. Therefore, it is important to ask about the social welfare effects of innovation by users. Henkel and von Hippel (2005) explored this matter and concluded that social welfare is likely to be higher in a world in which both users and manufacturers innovate than in a world in which only manufacturers innovate. 400 In this chapter, I first explain that innovation by users complements manufacturer innovation and can also be a source of success-enhancing new product ideas for manufacturers. Next, I note that innovation by users does not exhibit several welfare-reducing effects associated with innovation by manufacturers. Finally, I evaluate the effects of public policies on user innovation, and suggest modifications to those that---typically unintentionally---discriminate against innovation by users. 401 Social Welfare Effects of User Innovation 402 Social welfare functions are used in welfare economics to provide a measure of the material welfare of society, using economic variables as inputs. A social welfare function can be designed to express many social goals, ranging from population life expectancies to income distributions. Much of the literature on product diversity, innovation, and social welfare evaluates the impact of economic phenomena and policy on social welfare from the perspective of total income of a society without regard to how that income is distributed. We will take that viewpoint here. 403 User Innovation Improves Manufacturers' Success Rates 404 It is striking that most new products developed and introduced to the market by manufacturers are commercial failures. Mansfield and Wagner (1975) found the overall probability of success for new industrial products to be only 27 percent. Elrod and Kelman (1987) found an overall probability of success of 26 percent for consumer products. Balachandra and Friar (1997), Poolton and Barclay (1998), and Redmond (1995) found similarly high failure rates in new products commercialized. Although there clearly is some recycling of knowledge from failed projects to successful ones, much of the investment in product development is highly specific. This high failure rate therefore represents a huge inefficiency in the conversion of R&D investment to useful output, and a corresponding reduction in social welfare. 405 Research indicates that the major reason for the commercial failure of manufacturer-developed products is poor understanding of users' needs by manufacturer-innovators. The landmark SAPPHO study showed this in a very clear and convincing way. This study was based on a sample of 31 product pairs. Members of each pair were selected to address the same function and market. (For example, one pair consisted of two "roundness meters," each developed by a separate company.) One member of each pair was a commercial success (which showed that there was a market for the product type); the other was a commercial failure. The development process for each successful and failing product was then studied in detail. The primary factor found to distinguish success from failure was that a deeper understanding of the market and the need was associated with successful projects (Achilladelis et al. 1971; Rothwell et al. 1974). A study by Mansfield and Wagner (1975) came to the same conclusion. More recent studies of information stickiness and the resulting asymmetries of information held by users and manufacturers, discussed in chapter 3, support the reasonableness of this general finding. Users are the generators of information regarding their needs. The decline in accuracy and completeness of need information after transfer from user to manufacturer is likely to be substantial because important elements of this information are likely to be sticky (von Hippel 1994; Ogawa 1998). 406 Innovations developed by users can improve manufacturers' information on users' needs and so improve their new product introduction success rates. Recall from previous chapters that innovation by users is concentrated among lead users. These lead users tend, as we have seen, to develop functionally novel products and product modifications addressing their own needs at the leading edge of markets where potential sales are both small and uncertain. Manufacturers, in contrast, have poorer information on users' needs and use contexts, and will prefer to manufacture innovations for larger, more certain markets. In the short term, therefore, user innovations will tend to complement rather than substitute for products developed by manufacturers. In the longer term, the market as a whole catches up to the needs that motivated the lead user developments, and manufacturers will begin to find production of similar innovations to be commercially attractive. At that point, innovations by lead users can provide very useful information to manufacturers that they would not otherwise have. 407 As lead users develop and test their solutions in their own use environments, they learn more about the real nature of their needs. They then often freely reveal information about their innovations. Other users then may adopt the innovations, comment on them, modify and improve them, and freely reveal what they have done in turn. All of this freely revealed activity by lead users offers manufacturers a great deal of useful information about both needs embodied in solutions and about markets. Given access to a user-developed prototype, manufacturers no longer need to understand users' needs very accurately and richly. Instead they have the much easier task of replicating the function of user prototypes that users have already demonstrated are responsive to their needs. For example, a manufacturer seeking to commercialize a new type of surgical equipment and coming upon prototype equipment developed by surgeons need not understand precisely why the innovators want this product or even precisely how it is used; the manufacturer need only understand that many surgeons appear willing to pay for it and then reproduce the important features of the user-developed prototypes in a commercial product. 408 Observation of innovation by lead users and adoption by follow-on users also can give manufacturers a better understanding of the size of the potential market. Projections of product sales have been shown to be much more accurate when they are based on actual customer behavior than when they are based on potential buyers' pre-use expectations. Monitoring of field use of user-built prototypes and of their adoption by other users can give manufacturers rich data on precisely these matters and so should improve manufacturer's commercial success. In net, user innovation helps to reduce information asymmetries between users and manufacturers and so increases the efficiency of the innovation process. 409 User Innovation and Provisioning Biases 410 The economic literature on the impact of innovation on social welfare generally seeks to understand effects that might induce society to create too many product variations (overprovisioning) or too few (underprovisioning) from the viewpoint of net social economic income (Chamberlin 1950). Greater variety of products available for purchase is assumed to be desirable, in that it enables consumers to get more precisely what they want and/or to own a more diverse array of products. However, increased product diversity comes at a cost: smaller quantities of each product will be produced on average. This in turn means that development-related and production-related economies of scale are likely to be less. The basic tradeoff between variety and cost is what creates the possibility of overprovisioning or underprovisioning product variety. Innovations such as flexible manufacturing may reduce fixed costs associated with increased diversity and so shift the optimal degree of diversity upward. Nonetheless, the conflict still persists. 411 Henkel and I studied the welfare impact of adding users as a source of innovation to existing analyses of product diversity, innovation, and social welfare. Existing models uniformly contained the assumption that new products and services were supplied to the economy by manufacturers only. We found that the addition of innovation by users to these analyses largely avoids the welfare-reducing biases that had been identified. For example, consider "business stealing" (Spence 1976). This term refers to the fact that commercial manufacturers benefit by diverting business from their competitors. Since they do not take this negative externality into account, their private gain from introducing new products exceeds society's total gain, tilting the balance toward overprovision of variety. In contrast, a freely revealed user innovation may also reduce incumbents' business, but not to the innovator's benefit. Hence, innovation incentives are not socially excessive. 412 Freely revealed innovations by users are also likely to reduce deadweight loss caused by pricing of products above their marginal costs. (Deadweight loss is a reduction in social welfare that occurs when goods are sold at a price above their marginal cost of production.) When users make information about their innovations available for free, and if the marginal cost of revealing that information is zero, an imitator only has to bear the cost of adoption. This is statically efficient. The availability of free user innovations can also induce sellers of competing commercial offerings to reduce their prices, thus indirectly leading to another reduction in dead-weight loss. 413 Reducing prices toward marginal costs can also reduce incentives to over-provision variety (Tirole 1988). 414 Henkel and I also explored a few special situations where social welfare might be reduced by the availability of freely revealed user innovations. One of these was the effect of reduced pricing power on manufacturers that create "platform" products. Often, a manufacturer of such a product will want to sell the platform---a razor, an ink-jet printer, a video-game player---at a low margin or a loss, and then price necessary add-ons (razor blades, ink cartridges, video games) at a much higher margin. If the possibility of freely revealed add-ons developed by users makes development of a platform unprofitable for a manufacturer, social welfare can thereby be reduced. However, it is only the razor-vs.-blade pricing scheme that may become unprofitable. Indeed, if the manufacturer makes positive margins on the platform, then the availability of user-developed add-ons can have a positive effect: it can increase the value of the platform to users, and so allow manufacturers to charge higher margins on it and/or sell more units. Jeppesen (2004) finds that this is in fact the outcome when users introduce free game modifications (called mods) operating on proprietary game software platform products (called engines) sold by game manufacturers. Even though the game manufacturers also sell mods commercially that compete with free user mods, many provide active support for the development and diffusion of user mods built on their proprietary game engines, because they find that the net result is increased sales and profits. 415 Public Policy Choices 416 If innovation by users is welfare enhancing and is also significant in amount and value, then it makes sense to consider the effects of public policy on user innovation. An important first step would be to collect better data. Currently, much innovation by users---which may in aggregate turn out to be a very large fraction of total economic investment in innovation--- goes uncounted or undercounted. Thus, innovation effort that is volunteered by users, as is the case with many contributions to open source software, is currently not recorded by governmental statistical offices. This is also the case for user innovation that is integrated with product and service production. For example, much process innovation by manufacturers occurs on the factory floor as they produce goods and simultaneously learn how to improve their production processes. Similarly, many important innovations developed by surgeons are woven into learning by doing as they deliver services to patients. 417 Next, it will be important to review innovation-related public policies to identify and correct biases with respect to sources of innovation. On a level playing field, users will become a steadily more important source of innovation, and will increasingly substitute for or complement manufacturers' innovation-related activities. Transitions required of policy making to support this ongoing evolution are important but far from painless. To illustrate, we next review issues related to the protection intellectual property, related to policies restricting product modifications, related to source-biased subsidies for R&D, and related to control over innovation diffusion channels. 418 Intellectual Property 419 Earlier, when we explored why users might freely reveal their innovations, we concluded that it was often their best practical choice in view of how intellectual property law actually functions (or, often, does not function) to protect innovations today. For example, recall from chapter 6 that most innovators do not judge patents to be very effective, and that the availability of patent grant protection does not appear to increase innovation investments in most fields. Recall also that patent protection is costly to obtain, and thus of little value to developers of minor innovations---with most innovations being minor. We also saw that in practice it was often difficult for innovators to protect their innovations via trade secrecy: it is hard to keep a secret when many others know similar things, and when some of these information holders will lose little or nothing from freely revealing what they know. 420 These findings show that the characteristics of present-day intellectual property regimes as actually experienced by innovators are far from the expectations of theorists and policy makers. The fundamental reason that societies elect to grant intellectual property rights to innovators is to increase private investment in innovation. At the same time, economists have long known that there will be social welfare losses associated with these grants: owners of intellectual property will generally restrict the use of their legally protected information in order to increase private profits. In other words, intellectual property rights are thought to be good for innovation and bad for competition. The consensus view has long been that the good outweighs the bad, but Foray (2004) explains that this consensus is now breaking down. Some---not all---are beginning to think that intellectual property rights are bad for innovation too in many cases. 421 The need to grant private intellectual property rights to achieve socially desirable levels of innovation is being questioned in the light of apparent counterexamples. Thus, as we saw earlier, open source software communities do not allow contributing innovators to use their intellectual property rights to control the use of their code. Instead, contributors use their authors' copyright to assign their code to a common pool to which all--- contributors and non-contributors alike---are granted equal access. Despite this regime, innovation seems to be flourishing. Why? As we saw in our earlier discussions of why innovators might freely reveal their innovations, researchers now understand that significant private rewards to innovation can exist independent of intellectual property rights grants. As a general principle, intellectual property rights grants should not be offered if and when developers would seek protection but would innovate without it. 422 The debate rages. Gallini and Scotchmer (2002) assert that "intellectual property is the foundation of the modern information economy" and that "it fuels the software, lifesciences and computer industries, and pervades most other products we consume." They also conclude that the positive or negative effect of intellectual property rights on innovation depends centrally on "the ease with which innovators can enter into agreements for rearranging and exercising those rights." This is precisely the rub from the point of view of those who urge that present intellectual property regimes be reconsidered: it is becoming increasingly clear that in practice rearranging and exercising intellectual property rights is often difficult rather than easy. It is also becoming clear that the protections afforded by existing intellectual property law can be strategically deployed to achieve private advantage at the expense of general innovative progress (Foray 2004). 423 Consider an effect first pointed out by Merges and Nelson (1990) and further explored as the "tragedy of the anticommons" by Heller (1998) and Heller and Eisenberg (1998). A resource such as innovation-related information is prone to underuse---a tragedy of the anticommons---when multiple owners each have a right to exclude others and no one has an effective privilege of use. The nature of the patent grant can lead to precisely this type of situation. Patent law is so arranged that an owner of a patent is not granted the right to practice its invention---it is only granted the right to exclude others from practicing it. For example, suppose you invent and patent the chair. I then follow by inventing and patenting the rocking chair---implemented by building rockers onto a chair covered by your patent. In this situation I cannot manufacture a rocking chair without getting a license from you for the use of your chair patent, and you cannot build rocking chairs either without a license to my rocker patent. If we cannot agree on licensing terms, no one will have the right to build rocking chairs. 424 In theory and in a world of costless transactions, people could avoid tragedies of the anticommons by licensing or trading their intellectual property rights. In practice the situation can be very different. Heller and Eisenberg point specifically to the field of biomedical research, and argue that conditions for anticommons effects do exist there. In that field, patents are routinely allowed on small but important elements of larger research problems, and upstream research is increasingly likely to be private. "Each upstream patent," Heller and Eisenberg note, "allows its owner to set up another tollbooth on the road to product development, adding to the cost and slowing the pace of downstream biomedical innovation." 425 A second type of strategic behavior based on patent rights involves investing in large portfolios of patents to create "patent thickets"---dense networks of patent claims across a wide field (Merges and Nelson 1990; Hall and Ham Ziedonis 2001; Shapiro 2001; Bessen 2003). Patent thickets create plausible grounds for patent infringement suits across a wide field. Owners of patent thickets can use the threat of such suits to discourage others from investing research dollars in areas of technical advance relevant to their products. Note that this use of patents is precisely opposite to policy mak' intentions to stimulate innovation by providing ways for innovators to assert intellectual property rights. Indeed, Bessen and Hunt (2004) have found in the field of software that, on average, as firm's investments in patent protection go up, their investments in research and development actually go down. If this relationship proves causal, there is a reasonable explanation from the viewpoint of private profit: corporations that can use a patent thicket to deter others' research in a field might well decide that there is less need to do research of their own. 426 Similar innovation-retarding strategies can be applied by owners of large collections of copyrighted work in the movie, publishing, and software fields. Copyright owners can prevent others from building new works on characters (e.g. Mickey Mouse) that are already familiar to customers. The result is that owners of large portfolios of copyrighted work can gain an advantage over those with no or small portfolios in the creation of derivative works. Indeed, Benkler (2002) argues that institutional changes strengthening intellectual property protection tend to foster concentration of information production in general. Lessig (2001) and Boldrin and Levine (2002) arrive at a similarly negative valuation of overly strong and lengthy copyright protection. 427 These types of innovation-discouraging effects can affect innovation by users especially strongly. The distributed innovation system we have documented consists of users each of whom might have only a few innovations and a small amount of intellectual property. Such innovators are clearly hurt differentially by a system that gives advantage to the owners of large shares of the intellectual property in a field. 428 What can be done? A solution approach open to policy makers is to change intellectual property law so as to level the playing field. But owners of large amounts of intellectual property protected under the present system are often politically powerful, so this type of solution will be difficult to achieve. 429 Fortunately, an alternative solution approach may be available to innovators themselves. Suppose that many elect to contribute the intellectual property they individually develop to a commons in a particular field. If the commons then grows to contain reasonable substitutes for much of the proprietary intellectual property relevant to the field, the relative advantage accruing to large holders of this information will diminish and perhaps even disappear. At the same time and for the same reason, the barriers that privately held stocks of intellectual property currently may raise to further intellectual advance will also diminish. Lessig supports this possibility with his creation and publication of standard "Creative Commons" licenses on the website creativecommons.org. Authors interested in contributing their work to the commons, perhaps with some restrictions, can easily find and adopt an appropriate license at that site. 430 Reaching agreement on conditions for the formation of an intellectual commons can be difficult. Maurer (2005) makes this clear in his cautionary tale of the struggle and eventual failure to create a commons for data on human mutations. However, success is possible. For example, an extensive intellectual commons of software code is contained and maintained in the many open source software projects that now exist. 431 Interesting examples also exist regarding on the impact a commons can have on the value of intellectual property innovators seek to hold apart from it. Weber (2004) recounts the following anecdote: In 1988, Linux developers were building new graphical interfaces for their open source software. One of the most promising of these, KDE, was offered under the General Public License. However, Matthias Ettrich, its developer, had built KDE using a proprietary graphical library called Qt. He felt at the time that this could be an acceptable solution because Qt was of good quality and Troll Tech, owner of Qt, licensed Qt at no charge under some circumstances. However, Troll Tech did require a developer's fee be paid under other circumstances, and some Linux developers were concerned about having code not licensed under the GPL as part of their code. They tried to convince Troll Tech to change the Qt license so that it would be under the GPL when used in free software. But Troll Tech, as was fully within its rights, refused to do this. Linux developers then, as was fully within their rights, began to develop open source alternatives to Qt that could be licensed under the GPL. As those projects moved toward success, Troll Tech recognized that Qt might be surpassed and effectively shut out of the Linux market. In 2000 the company therefore decided to license Qt under the GPL. 432 Similar actions can keep conditions for free access to materials held within a commons from degrading and being lost over time. Chris Hanson, a Principal Research Scientist at MIT, illustrates this with an anecdote regarding an open source software component called ipfilter. The author of ipfilter attempted to "lock" the program by changing licensing terms of his program to disallow the distribution of modified versions. His reasoning was that Ipfilter, a network-security filter, must be as bug-free as possible, and that this could best be ensured by his controlling access. His actions ignited a flame war in which the author was generally argued to be selfish and overreaching. His program, then an essential piece of BSD operating systems, was replaced by newly written code in some systems within the year. The author, Hanson notes, has since changed his licensing terms back to a standard BSD-style (unrestricted) license. 433 We will learn over time whether and how widely the practice of creating and defending intellectual commons diffuses across fields. There obviously can be cases where it will continue to make sense for innovators, and for society as well, to protect innovations as private intellectual property. However, it is likely that many user innovations are kept private not so much out of rational motives as because of a general, not-thought-through attitude that "we do not give away our intellectual property," or because the administrative cost of revealing is assumed to be higher than the benefits. Firms and society can benefit by rethinking the benefits of free revealing and (re)developing policies regarding what is best kept private and what is best freely revealed. 434 Constraints on Product Modification 435 Users often develop prototypes of new products by buying existing commercial products and modifying them. Current efforts by manufacturers to build technologies into the products they sell that restrict the way these products are used can undercut users' traditional freedom to modify what they purchase. This in turn can raise the costs of innovation development by users and so lessen the amount of user innovation that is done. For example, makers of ink-jet printers often follow a razor-and-blade strategy, selling printers at low margins and the ink cartridges used in them at high margins. To preserve this strategy, printer manufacturers want to prevent users from refilling ink cartridges with low-cost ink and using them again. Accordingly, they may add technical modifications to their cartridges to prevent them from functioning if users have refilled them. This manufacturer strategy can potentially cut off both refilling by the economically minded and modifications by user-innovators that might involve refilling (Varian 2002). Some users, for example, have refilled cartridges with special inks not sold by printer manufacturers in order to adapt ink-jet printing to the printing of very high-quality photographs. Others have refilled cartridges with food colorings instead of inks in order to develop techniques for printing images on cakes. Each of these applications might have been retarded or prevented by technical measures against cartridge refilling. 436 The Digital Millennium Copyright Act, a legislative initiative intended to prevent product copying, may negatively affect users' abilities to change and improve the products they own. Specifically, the DMCA makes it a crime to circumvent anti-piracy measures built into most commercial software. It also outlaws the manufacture, sale, or distribution of code-cracking devices used to illegally copy software. Unfortunately, code cracking is also a needed step for modification of commercial software products by user-innovators. Policy makers should be aware of "collateral damage" that may be inflicted on user innovation by legislation aimed at other targets, as is likely in this case. 437 Control over Distribution Channels 438 Users that innovate and wish to freely diffuse innovation-related information are able to do so cheaply in large part because of steady advances in Internet distribution capabilities. Controls placed on such infrastructural factors can threaten and maybe even totally disable distributed innovation systems such as the user innovation systems documented in this book. For example, information products developed by users are commonly distributed over the Internet by peer-to-peer sharing networks. A firm that owns both a channel and content (e.g., a cable network) may have a strong incentive to shut out or discriminate against content developed by users or others in favor of its own content. The transition from the chaotic, fertile early days of radio in the United States when many voices were heard, to an era in which the spectrum was dominated by a few major networks---a transition pushed by major firms and enforced by governmental policy making--- provides a sobering example of what could happen (Lessig 2001). It will be important for policy makers to be aware of this kind of incentive problem and address it---in this case perhaps by mandating that ownership of content and ownership of channel be separated, as has long been the case for other types of common carriers. 439 R&D Subsidies and Tax Credits 440 In many countries, manufacturing firms are rewarded for their innovative activity by R&D subsidies and tax credits. Such measures can make economic sense if average social returns to innovation are significantly higher than average private returns, as has been found by Mansfield et al. (1977) and others. However, important innovative activities carried out by users are often not similarly rewarded, because they tend to not be documentable as formal R&D activities. As we have seen, users tend to develop innovations in the course of "doing" in their normal use environments. Bresnahan and Greenstein (1996a) make a similar point. They investigate the role of "co-invention" in the move by users from mainframe to client-server architecture.15 By "co-invention" Bresnahan and Greenstein mean organizational changes and innovations developed and implemented by users that are required to take full advantage of a new invention. They point out the high importance that co-invention has for realizing social returns from innovation. They consider the federal government's support for creating "national information infrastructures" insufficient or misallocated, since they view co-invention is the bottleneck for social returns and likely the highest value locus for invention. 15 See also Bresnahan and Greenstein 1996b; Bresnahan and Saloner 1997; Saloner and Steinmueller 1996. 441 Efforts to level the playing field for user innovation and manufacturer innovation could, of course, also go in the direction of lessening R&D subsidies or tax credits for all rather than attempting to increase user-innovators' access to subsidies. However, if directing subsidies to user-innovators seems desirable, social welfare will be best served if policy makers link them to free revealing by user-innovators as well as or instead of tying them to users' private investments in the development of products for exclusive in-house use. Otherwise, duplication of effort by users interested in the same innovation will reduce potential welfare gains. 442 In sum, the welfare-enhancing effects found for freely revealed user innovations suggest that policy makers should consider conditions required for user innovation when creating policy and legislation. Leveling the playing field for user-innovators and manufacturer-innovators will doubtless force more rapid change onto manufacturers. However, as will be seen in the next chapter, manufacturers can adapt to a world in which user innovation is at center stage. 443 9 Democratizing Innovation 444 We have learned that lead users sometimes develop and modify products for themselves and often freely reveal what they have done. We have also seen that many users can be interested in adopting the solutions that lead users have developed. Taken together, these findings offer the basis for user-centered innovation systems that can entirely supplant manufacturer-based innovation systems under some conditions and complement them under most. User-centered innovation is steadily increasing in importance as computing and communication technologies improve. 445 I begin this chapter with a discussion of the ongoing democratization of innovation. I then describe some of the patterns in user-centered innovation that are emerging. Finally, I discuss how manufacturers can find ways to profitably participate in emerging, user-centered innovation processes. 446 The Trend toward Democratization 447 Users' abilities to develop high-quality new products and services for themselves are improving radically and rapidly. Steady improvements in computer software and hardware are making it possible to develop increasingly capable and steadily cheaper tools for innovation that require less and less skill and training to use. In addition, improving tools for communication are making it easier for user innovators to gain access to the rich libraries of modifiable innovations and innovation components that have been placed into the public domain. The net result is that rates of user innovation will increase even if users' heterogeneity of need and willingness to pay for "exactly right" products remain constant. 448 The radical nature of the change that is occurring in design capabilities available to even individual users is perhaps difficult for those without personal innovation experience to appreciate. An anecdote from my own experience may help as illustration. When I was a child and designed new products that I wanted to build and use, the ratio of not-too-pleasurable (for me) effort required to actually build a prototype relative to the very pleasurable effort of inventing it and use-testing it was huge. (That is, in terms of the design, build, test, evaluate cycle illustrated in figure 5.1, the effort devoted to the "build" element of the cycle was very large and the rate of iteration and learning via trial and error was very low.) 449 In my case it was especially frustrating to try to build anything sophisticated from mechanical parts. I did not have a machine shop in which I could make good parts from scratch, and it often was difficult to find or buy the components I needed. As a consequence, I had to try to assemble an approximation of my ideas out of vacuum cleaner parts and other bits of metal and plastic and rubber that I could buy or that were lying around. Sometimes I failed at this and had to drop an exciting project. For example, I found no way to make the combustion chamber I needed to build a large pulse-jet engine for my bicycle (in retrospect, perhaps a lucky thing!). Even when I succeeded, the result was typically "unaesthetic": the gap between the elegant design in my mind and the crude prototype that I could realize was discouragingly large. 450 Today, in sharp contrast, user firms and increasingly even individual hobbyists have access to sophisticated design tools for fields ranging from software to electronics to musical composition. All these information-based tools can be run on a personal computer and are rapidly coming down in price. With relatively little training and practice, they enable users to design new products and services---and music and art---at a satisfyingly sophisticated level. Then, if what has been created is an information product, such as software or music, the design is the actual product---software you can use or music you can play. 451 If one is designing a physical product, it is possible to create a design and even conduct some performance testing by computer simulation. After that, constructing a real physical prototype is still not easy. However, today users do have ready access to kits that offer basic electronic and mechanical building blocks at an affordable price, and physical product prototyping is becoming steadily easier as computer-driven 3-D parts printers continue to go up in sophistication while dropping in price. Very excitingly, even today home-built prototypes need not be poorly fashioned items that will fall apart with a touch in the wrong place---the solution components now available to users are often as good as those available to professional designers. 452 Functional equivalents of the resources for innovation just described have long been available within corporations to a lucky few. Senior designers at firms have long been supported by engineers and designers under their direct control, and also with other resources needed to quickly construct and test prototype designs. When I took a job as R&D manager at a start-up firm after college, I was astounded at the difference professional-quality resources made to both the speed and the joy of innovation. Product development under these conditions meant that the proportion of one's effort that could be focused on the design and test portions of the innovation cycle rather than on prototype building was much higher, and the rate of progress was much faster. 453 The same story can be told in fields from machine design to clothing design: just think of the staffs of seamstresses and models supplied by clothing manufacturers to their "top designers" so that these few can quickly realize and test many variations on their designs. In contrast, think of the time and effort that equally talented designers without such staff assistance must engage in to stitch together even a single high-quality garment prototype on their own. 454 But, as we learned in chapter 7, the capability and the information needed to innovate in important ways are in fact widely distributed. Given this finding, we can see that the traditional pattern of concentrating innovation-support resources on just a few pre-selected potential innovators is hugely inefficient. High-cost resources for innovation support cannot be allocated to "the right people," because one does not know who they are until they develop an important innovation. When the cost of high-quality resources for design and prototyping becomes very low---which is the trend we have described---these resources can be diffused widely, and the allocation problem then diminishes in significance. The net result is and will be to democratize the opportunity to create. 455 Democratization of the opportunity to create is important beyond giving more users the ability to make exactly right products for themselves. As we saw in a previous chapter, the joy and the learning associated with creativity and membership in creative communities are also important, and these experiences too are made more widely available as innovation is democratized. The aforementioned Chris Hanson, a Principal Research Scientist at MIT and a maintainer in the Debian Linux community, speaks eloquently of this in his description of the joy and value he finds from his participation in an open source software community: 456 Creation is unbelievably addictive. And programming, at least for skilled programmers, is highly creative. So good programmers are compelled to program to feed the addiction. (Just ask my wife!) Creative programming takes time, and careful attention to the details. Programming is all about expressing intent, and in any large program there are many areas in which the programmer's intent is unclear. Clarification requires insight, and acquiring insight is the primary creative act in programming. But insight takes time and often requires extensive conversation with one's peers. 457 Free-software programmers are relatively unconstrained by time. Community standards encourage deep understanding, because programmers know that understanding is essential to proper function. They are also programming for themselves, and naturally they want the resulting programs to be as good as they can be. For many, a free software project is the only context in which they can write a program that expresses their own vision, rather than implementing someone else's design, or hacking together something that the marketing department insists on. No wonder programmers are willing to do this in their spare time. This is a place where creativity thrives. 458 Creativity also plays a role in the programming community: programming, like architecture, has both an expressive and a functional component. Unlike architecture, though, the expressive component of a program is inaccessible to non-programmers. A close analogy is to appreciate the artistic expression of a novel when you don't know the language in which it is written, or even if you know the language but are not fluent. This means that creative programmers want to associate with one another: only their peers are able to truly appreciate their art. Part of this is that programmers want to earn respect by showing others their talents. But it's also important that people want to share the beauty of what they have found. This sharing is another act that helps build community and friendship. 459 Adapting to User-Centered Innovation---Like It or Not 460 User-centered innovation systems involving free revealing can sometimes supplant product development carried out by manufacturers. This outcome seems reasonable when manufacturers can obtain field-tested user designs at no cost. As an illustration, consider kitesurfing (previously discussed in chapter 7). The recent evolution of this field nicely shows how manufacturer-based product design may not be able to survive when challenged by a user innovation community that freely reveals leading-edge designs developed by users. In such a case, manufacturers may be obliged to retreat to manufacturing only, specializing in modifying user-developed designs for producibility and manufacturing these in volume. 461 Recall that equipment for kitesurfing was initially developed and built by user-enthusiasts who were inventing both kitesurfing techniques and kitesurfing equipment interdependently. Around 1999, the first of several small manufacturers began to design and sell kitesurfing equipment commercially. The market for kitesurfing equipment then began to grow very rapidly. In 2001 about 5,000 kite-and-board sets were sold worldwide. In 2002 the number was about 30,000, and in 2003 it was about 70,000. With a basic kite-and-board set selling for about $1,500, total sales in 2003 exceeded $100 million. (Many additional kites, home-made by users, are not included in this calculation.) As of 2003, about 40 percent of the commercial market was held by a US firm called Robbie Naish (Naishkites.com). 462 Recall also that in 2001 Saul Griffith, an MIT graduate student, established an Internet site called Zeroprestige.com as a home for a community of kitesurfing users and user-innovators. In 2003, the general consensus of both site participants and manufacturers was that the kite designs developed by users and freely revealed on Zeroprestige.com were at least as advanced as those developed by the leading manufacturers. There was also a consensus that the level of engineering design tools and aggregate rate of experimentation by kite users participating on the Zeroprestige.com site was superior to that within any kite manufacturer. Indeed, this collective user effort was probably superior in quality and quantity to the product-development work carried out by all manufacturers in the industry taken together. 463 In late 2003, a perhaps predictable event occurred: a kite manufacturer began downloading users' designs from Zeroprestige.com and producing them for commercial sale. This firm had no internal kitesurfing product-development effort and offered no royalties to user-innovators---who sought none. It also sold its products at prices much lower than those charged by companies that both developed and manufactured kites. 464 It is not clear that manufacturers of kitesurfing equipment adhering to the traditional developer-manufacturer model can---or should---survive this new and powerful combination of freely revealed collaborative design and prototyping effort by a user innovation community combined with volume production by a specialist manufacturer. In effect, free revealing of product designs by users offsets manufacturers' economies of scale in design with user communities' economies of scope. These economies arise from the heterogeneity in information and resources found in a user community. 465 Manufacturers' Roles in User-Centered Innovation 466 Users are not required to incorporate manufacturers in their product-development and product-diffusion activities. Indeed, as open source software projects clearly show, horizontal innovation communities consisting entirely of users can develop, diffuse, maintain, and consume software and other information products by and for themselves---no manufacturer is required. Freedom from manufacturer involvement is possible because information products can be "produced" and distributed by users essentially for free on the web (Kollock 1999). In contrast, production and diffusion of physical products involves activities with significant economies of scale. For this reason, while product development and early diffusion of copies of physical products developed by users can be carried out by users themselves and within user innovation communities, mass production and general diffusion of physical products incorporating user innovations are usually carried out by manufacturing firms. 467 For information products, general distribution is carried out within and beyond the user community by the community itself; no manufacturer is required: 468 Innovating lead users ➔ All users. 469 For physical products, general distribution typically requires manufacturers: 470 Innovating lead users ➔ Manufacturer ➔ All users. 471 In light of this situation, how can, should, or will manufacturers of products, services, and processes play profitable roles in user-centered innovation systems? Behlendorf (1999), Hecker (1999) and Raymond (1999) explore what might be possible in the specific context of open source software. More generally, many are experimenting with three possibilities: (1) Manufacturers may produce user-developed innovations for general commercial sale and/or offer a custom manufacturing service to specific users. (2) Manufacturers may sell kits of product-design tools and/or "product platforms" to ease users' innovation-related tasks. (3) Manufacturers may sell products or services that are complementary to user-developed innovations. 472 Producing User-Developed Products 473 Firms can make a profitable business from identifying and mass producing user-developed innovations or developing and building new products based on ideas drawn from such innovations. They can gain advantages over competitors by learning to do this better than other manufacturers. They may, for example, learn to identify commercially promising user innovations more effectively that other firms. Firms using lead user search techniques such as those we will describe in chapter 10 are beginning to do this systematically rather than accidentally---surely an improvement. Effectively transferring user-developed innovations to mass manufacture is seldom as simple as producing a product based on a design by a single lead user. Often, a manufacturer combines features developed by several independent lead users to create an attractive commercial offering. This is a skill that a company can learn better than others in order to gain a competitive advantage. 474 The decision as to whether or when to take the plunge and commercialize a lead user innovation(s) is also not typically straightforward, and companies can improve their skills at inviting in the relevant information and making such assessments. As was discussed previously, manufacturers often do not understand emerging user needs and markets nearly as well as lead users do. Lead users therefore may engage in entrepreneurial activities, such as "selling" the potential of an idea to potential manufacturers and even lining up financing for a manufacturer when they think it very important to rapidly get widespread diffusion of a user-developed product. Lettl, Herstatt, and Gemýnden (2004), who studied the commercialization of major advances in surgical equipment, found innovating users commonly engaging in these activities. It is also possible, of course, for innovating lead users to become manufacturers and produce the products they developed for general commercial sale. This has been shown to occur fairly frequently in the field of sporting goods (Shah 2000; Shah and Tripsas 2004; Hienerth 2004). 475 Manufacturers can also elect to provide custom production or "foundry" services to users, differentiating themselves by producing users' designs faster, better, and/or cheaper than competitors. This type of business model is already advanced in many fields. Custom machine shops specialize in manufacturing mechanical parts to order; electronic assembly shops produce custom electronic products, chemical manufacturers offer "toll" manufacturing of custom products designed by others, and so on. Suppliers of custom integrated circuits offer an especially good example of custom manufacture of products designed by users. More than $15 billion worth of custom integrated circuits were produced in 2002, and the cumulative average growth rate of that market segment was 29 percent. Users benefit from designing their own circuits by getting exactly what they want more quickly than manufacturer-based engineers could supply what they need, and manufacturers benefit from producing the custom designs for users (Thomke and von Hippel 2002). 476 Supplying Toolkits and/or Platform Products to Users 477 Users interested in designing their own products want to do it efficiently. Manufacturers can therefore attract them to kits of design tools that ease their product-development tasks and to products that can serve as "platforms" upon which to develop and operate user-developed modifications. Some are supplying users with proprietary sets of design tools only. Cadence, a supplier of design tools for corporate and even individual users interested in designing their own custom semiconductor chips, is an example of this. Other manufacturers, including Harley-Davidson in the case of motorcycles and Microsoft in the case of its Excel spreadsheet software, sell platform products intentionally designed for post-sale modification by users. 478 Some firms that sell platform products or design tools to users have learned to systematically incorporate valuable innovations that users may develop back into their commercial products. In effect, this second strategy can often be pursued jointly with the manufacturing strategy described above. Consider, for example, StataCorp of College Station, Texas. StataCorp produces and sells Stata, a proprietary software program designed for statistics. It sells the basic system bundled with a number of families of statistical tests and with design tools that enable users to develop new tests for operation on the Stata platform. Advanced customers, many of them statisticians and social science researchers, find this capability very important to their work and do develop their own tests. Many then freely reveal tests they have developed on Internet websites set up by the users themselves. Other users then visit these sites to download and use, and perhaps to test, comment on, and improve these tests, much as users do in open source software communities. 479 StataCorp personnel monitor the activity at user sites, and note the new tests that are of interest to many users. They then bring the most popular tests into their product portfolio as Stata modules. To do this, they rewrite the user's software code while adhering to the principles pioneered by the user-innovator. They then subject the module to extensive validation testing---a very important matter for statisticians. The net result is a symbiotic relationship. User-innovators are publicly credited by Stata for their ideas, and benefit by having their modules professionally tested. StataCorp gains a new commercial test module, rewritten and sold under its own copyright. Add-ons developed by users that are freely revealed will increase StataCorp's profits more than will equivalent add-ons developed and sold by manufacturers (Jokisch 2001). Similar strategies are pursued by manufacturers of simulator software (Henkel and Thies 2003). 480 Note, however, that StataCorp, in order to protect its proprietary position, does not reveal the core of its software program to users, and does not allow any user to modify it. This creates problems for those users who need to make modifications to the core in order to solve particular problems they encounter. Users with problems of this nature and users especially concerned about price have the option of turning to non-proprietary free statistical software packages available on the web, such as the "R" project (www.r-project.org). These alternatives are developed and supported by user communities and are available as open source software. The eventual effect of open source software alternatives on the viability of the business models of commercial vendors such as StataCorp and its competitors remains to be seen. 481 A very similar pattern exists in the online gaming industry. Vendors of early online computer games were surprised to discover that sophisticated users were deciphering their closed source code in order to modify the games to be more to their liking. Some of these "mods" attracted large followings, and some game vendors were both impressed and supportive. Manufacturers also discovered that the net effect of user-developed mods was positive for them: mods actually increased the sales of their basic software, because users had to buy the vendors' proprietary software engine code in order to play the mods. Accordingly, a number of vendors began to actively support user-developers by supplying them with design tools to make it easier for them to build mods on their proprietary engine platforms (Jeppesen and Molin 2003). 482 Both manufacturers and users involved with online gaming are experimenting with the possibilities of user-manufacturer symbiosis in a number of additional ways. For example, some vendors are experimenting with creating company-supported distribution channels through which users---who then become vendors---can sell their mods rather than simply offering them as free downloads (Jeppesen 2004). At the same time, some user communities are working in the opposite direction by joining together to develop open source software engines for video games. If the latter effort is successful, it will offer mod developers a platform and design tools that are entirely non-proprietary for the first time. As in the case of statistical software, the eventual outcomes of all these experiments are not yet clear. 483 As a final example of a strategy in which manufacturers offer a platform to support user innovation of value to them, consider General Electric's innovation pattern with respect to the magnetic-resonance imaging machines it sells for medical use. Michael Harsh (GE's Director of R&D in the division that produces MRI machines) and his colleagues realized that nearly all the major, commercially important improvements to these machines are developed by leading-edge users rather than by GE or by competing machine producers. They also knew that commercialization of user-developed improvements would be easier and faster for GE if the users had developed their innovations using a GE MRI machine as a platform rather than a competitor's machine. Since MRI machines are expensive, GE developed a policy of selectively supplying machines at a very low price to scientists GE managers judged most likely to develop important improvements. These machines are supplied with restrictive interlocks removed so that the users can easily modify them. In exchange for this research support, the medical researchers give GE preferred access to innovations they develop. Over the years, supported researchers have provided a steady flow of significant improvements that have been first commercialized by GE. Managers consider the policy a major source of GE's commercial success in the MRI field. 484 Providing Complementary Products or Services 485 Many user innovations require or benefit from complementary products or services, and manufacturers can often supply these at a profit. For example, IBM profits from user innovation in open source software by selling the complement of computer hardware. Specifically, it sells computer servers with open source software pre-installed, and as the popularity of that software goes up, so do server sales and profits. A firm named Red Hat distributes a version of the open source software computer operating system Linux, and also sells the complementary service of Linux technical support to users. Opportunities to provide profitable complements are not necessarily obvious at first glance, and providers often reap benefits without being aware of the user innovation for which they are providing a complement. Hospital emergency rooms, for example, certainly gain considerable business from providing medical care to the users and user-developers of physically demanding sports, but may not be aware of this. 486 Discussion 487 All the examples above explore how manufacturers can integrate themselves into a user-centered innovation system. However, manufacturers will not always find user innovations based on or related to their products to be in their interest. For example, manufacturers may be concerned about legal liabilities and costs sometimes associated with "unauthorized user tinkering." For example, an automaker might legitimately worry about the user-programmed engine controller chips that racing aficionados and others often install to change their cars' performance. The result can be findings of eventual commercial value as users explore new performance regimes that manufacturers' engineers might not have considered. However, if users choose to override manufacturers' programming to increase engine performance, there is also a clear risk of increased warrantee costs for manufacturers if engines fail as a consequence (Mollick 2004). 488 We have seen that manufacturers can often find ways to profit from user innovation. It is also the case, however, that user innovators and user innovation communities can provide many of these same functions for themselves. For example, StataCorp is successfully selling a proprietary statistical software package. User-developed alternatives exist on the web that are developed and maintained by user-innovators and can be downloaded at no charge. Which ownership model will prove more robust under what circumstances remains to be seen. Ultimately, since users are the customers, they get to choose. 489 10 Application: Searching for Lead User Innovations 490 Users and manufacturers can apply the insights developed in this book to improve their innovation processes. In this chapter, I illustrate by showing how firms can profit by systematically searching for innovations developed by lead users. I first explain how this can be done. I then present findings of a study conducted at 3M to assess the effectiveness of lead user idea-generation techniques. Finally, I briefly review other studies reporting systematic searches for lead users by manufacturers, and the results obtained. 491 Searching for Lead Users 492 Product-development processes traditionally used by manufacturers start with market researchers who study customers in their target markets to learn about unsatisfied needs. Next, the need information they uncover is transferred to in-house product developers who are charged with developing a responsive product. In other words, the approach is to find a user need and to fill it by means of in-house product development. 493 These traditional processes cannot easily be adapted to systematic searching for lead user innovations. The focus on target-market customers means that lead users are regarded as outliers of no interest. Also, traditional market-research analyses focus on collecting and analyzing need information and not on possible solutions that users may have developed. For example, if a user says "I have developed this new product to make task X more convenient," market-research analyses typically will note that more convenience is wanted but not record the user-developed solution. After all, product development is the province of in-house engineers! 494 We are therefore left with a question: How can manufacturers build a product-development process that systematically searches for and evaluates lead user-generated innovations? (See figure 10.1.) It turns out that the answer differs depending on whether the lead users sought are at the leading edge of "advanced analog" fields or at the leading edge of target markets. Searching for the former is more difficult, but experience shows that the user-developed innovations that are most radical (and profitable) relative to conventional thinking often come from lead users in "advanced analog" fields. 495 [di_evh_f10-1.png] 496 Figure 10.1 Innovations by lead users precede equivalent commercial products. 497 Identifying Lead Users in Advanced Analog Fields 498 Lead users in advanced analog fields experience needs that are related to but more extreme than those being faced by any users, including lead users, within the target market. They also often face a different set of constraints than those affecting users in the target market. These differences can force them to develop solutions that are entirely new from the perspective of the target market. 499 As an example, consider the relationship between the braking requirements faced by users of automobiles (let's call auto users the target market) and the braking requirements faced by large commercial airplanes as they land on an airport runway (the advanced analog market). Clearly, the braking demands on large airplanes are much more extreme. Airplanes are much heavier than autos and land at higher speeds: their brakes must rapidly dissipate hundreds of times more energy to bring the vehicle to a stop. Also, the situational constraints are different. For example, auto drivers are often assisted in braking in winter by the application of salt or sand to icy roads. These aids cannot be applied in the case of aircraft: salt would damage aircraft bodies, and sand would be inhaled into jet engines and damage them. 500 The result of the more extreme demands and additional constraints placed on solutions to aircraft braking was the development of antilock braking systems (ABS) for aircraft. Auto firms conducting searches for valuable lead user innovations regarding auto braking were able to learn about this out-of-field innovation and adapt if for use in autos---where it is common today. Before the development of ABS for autos, an automobile firm could have learned about the underlying concept by studying the practices of users with a strong need for controlling skidding while braking such as stock car auto racing teams. These lead users had learned to manually "pump" their brakes to help control this problem. However, auto company engineers were able to learn much more by studying the automated solutions developed in the "advanced analog" field of aerospace.16 16 ABS braking is intended to keep a vehicle's wheels turning during braking. ABS works by automatically and rapidly "pumping" the brakes. The result is that the wheels continue to revolve rather than "locking up," and the operator continues to have control over steering. 501 Finding lead users in advanced analog markets can be difficult because discovering the relevance of a particular analog can itself be a creative act. One approach that has proven effective is to ask the more easily identified lead users in target markets for nominations. These lead users tend to know about useful advanced analogs, because they have been struggling with their leading-edge problems for a long time, and often have searched beyond the target market for information. 502 Networking from innovators to more advanced innovators in this way is called pyramiding (von Hippel, Thomke, and Sonnack 1999). Pyramiding is a modified version of the "snowballing" technique sometimes used by sociologists to identify members of a group or accumulate samples of rare respondents (Bijker 1995). Snowballing relies on the fact that people with rare interests or attributes tend to know others like themselves. Pyramiding modifies this idea by assuming that people with a strong interest in a topic or field can direct an enquiring researcher to people more expert than themselves. Experiments have shown that pyramiding can identify high-quality informants much more efficiently than can mass-screening techniques under many conditions (von Hippel, Franke, and Prýgl 2005). Pyramiding was made into a practical industrial process by Mary Sonnack, a Division Scientist at 3M, and Joan Churchill, a psychologist specializing in the development of industrial training programs. 503 Identifying Lead Users in Target Markets 504 In general it is easier to identify users at the leading edge of target markets than it is to identify users in advanced analog fields. Screening for users with lead user characteristics can be used. When the desired type of lead user is so rare as to make screening impractical---often the case---pyramiding can be applied. In addition, manufacturers can take advantage of the fact that users at the leading edge of a target market often congregate at specialized sites or events that manufacturers can readily identify. At such sites, users may freely reveal what they have done and may learn from others about how to improve their own practices still further. Manufacturers interested in learning from these lead users can easily visit the sites and listen in. For example, sports equipment companies can go to sporting meets where lead users are known to compete, observe user innovations in action, and compare notes. 505 Essentially the same thing can be done at virtual sites. For example, recall the practices of StataCorp, a supplier of statistical software. Stata sells a set of standard statistical tests and also a language and tools that statisticians can use to design new tests to serve their own evolving needs. Some Stata users (statisticians) took the initiative to set up a few specialized websites, unaffiliated with StataCorp, where they post their innovations for others to download, use, comment on, and improve. StataCorp personnel visit these sites, learn about the user innovations, and observe which tests seem to be of interest to many users. They then develop proprietary versions of the more generally useful tests as commercial products. 506 When specialized rendezvous sites for lead users don't exist in a particular field, manufacturers may be able to create them. Technicon Corporation, for example, set up a series of seminars at which innovating users of their medical equipment got together and exchanged information on their innovations. Technicon engineers were free to listen in, and the innovations developed by these users were the sources of most of Technicon's important new product improvements (von Hippel and Finkelstein 1979). 507 The 3M Experiment 508 To test whether lead users in advanced analog fields can in fact generate information that leads to commercially valuable new products, Lilien, Morrison, Searls, Sonnack, and von Hippel (2002) studied a natural experiment at 3M. That firm was carrying out both lead user projects and traditional market research-based idea-generation projects in the same divisions at the same time, and in sufficient numbers to make statistical comparisons of outcomes possible. 509 Methods 510 3M first began using the lead user method in one division in 1996. By May 2000, when data collection began, five divisions of 3M had completed seven lead user (LU) idea-generation projects and had funded further development of the product concepts generated by five of these. These same five divisions also had 42 contemporaneously funded projects that used "find a need and fill it" idea-generation methodologies that were traditional practice at 3M. We used these two samples of funded ideas to compare the performance of lead user idea-generation projects with traditional idea-generation projects. Although 3M cooperated in the study and permitted access to company records and to members of the product-development teams, the firm did not offer a controlled experimental setting. Rather, we as researchers were required to account for any naturally occurring differences after the fact. 511 Our study methodology required a pre-post/test-control situation, with at least quasi-random assignments to treatment cells (Cook and Campbell 1979). In other words, our goal was to compare samples of development projects in 3M divisions that differed with respect to their use of lead user idea-generation methods, but that were as similar as possible in other respects. Identifying, understanding, and controlling for the many potential sources of difference that could affect the natural experiment involved careful field explorations. Thus, possible differences between project staffing and performance incentives applied to LU and non-LU idea-generation projects were assessed. We looked for (and did not find) differences in the capabilities or motivation of LU and non-LU project team members with respect to achieving a major new product advance. 3M managers also said that there was no difference in these matters, and a content analysis of formal annual performance goals set for the individual LU and non-LU team members in a division that allowed access to these data supported their views. 512 We also found no major differences in the innovation opportunities teams faced. They also looked for Hawthorne or placebo effects that might affect the project teams differentially, and found none. (The Hawthorne effect can be described as "I do better because extra attention is being paid to me or to my performance." The placebo effect can be described as "I expect this process will work and will strive to get the results I have been told are likely.") We concluded that the 3M samples of funded LU and non-LU idea-generation projects, though not satisfying the random assignment criterion for experimental design, appeared to satisfy rough equivalence criteria in test and control conditions associated with natural or quasi-experimentation. Data were collected by interviews and by survey instruments. 513 With respect to the intended difference under study---the use of lead user methods within projects---all lead user teams employed an identical lead user process taught to them with identical coaching materials and with coaching provided by members of the same small set of internal 3M coaches. Each lead user team consisted of three or four members of the marketing and technical departments of the 3M division conducting the project. Teams began by identifying important market trends. Then, they engaged in pyramiding to identify lead users with respect to each trend both within the target market and in advanced analog markets. Information from a number of innovating lead users was then combined by the team to create a new product concept and business plan---an "LU idea" (von Hippel, Thomke, and Sonnack 1999). 514 Non-lead-user idea-generation projects were conducted in accordance with traditional 3M practices. I refer to these as non-LU idea generation methods and to teams using them as non-LU teams. Non-LU teams were similar to lead user teams in terms of size and make-up. They used data sources for idea generation that varied from project to project. Market data collected by outside organizations were sometimes used, as were data from focus groups with major customers and from customer panels, and information from lab personnel. Non-LU teams collected market information from target markets users but not from lead users. 515 Findings 516 Our research compared all funded product concepts generated by LU and non-LU methods from February 1999 to May 2000 in each of the five 3M divisions that had funded one or more lead-user-developed product concepts. During that time, five ideas generated by lead user projects were being funded, along with 42 ideas generated by non-LU idea-generation methods. The results of these comparisons can be seen in table 10.1. Product concepts generated by seeking out and learning from lead users were found to be significantly more novel than those generated by non-LU methods. They were also found to address more original or newer customer needs, to have significantly higher market share, to have greater potential to develop into an entire product line, and to be more strategically important. The lead-user-developed product concepts also had projected annual sales in year 5 that were greater than those of ideas generated by non-LU methods by a factor of 8---an average of $146 million versus an average of $18 million in forecast annual sales. Thus, at 3M, lead user idea-generation projects clearly did generate new product concepts with much greater commercial potential than did traditional, non-LU methods (p < 0.005). 517 Table 10.1 Concepts for new products developed by lead user project teams had far more commercial promise than those developed by non-lead-user project teams. 518
LU product concepts (n =5)Non-LU product concepts (n = 42)Significance
Factors related to value of concept
Novelty compared with competition a9.66.80.01
Originality/newness of customer needs addressed8.35.30.09
% market share in year 568%33%0.01
Estimated sales in year 5 (deflated for forecast error)$146m$18m0.00
Potential for entire product family a10.07.50.03
Operating profit22%24.0%0.70
Probability of success80%66%0.24
Strategic importance a9.67.30.08
Intellectual property protection a7.16.70.80
Factors related to organizational fit of concept
Fit with existing distribution channels a8.88.00.61
Fit with existing manufacturing capabilities a7.86.70.92
Fit with existing strategic plan a9.88.40.24
 519 Source: Lilien et al. 2002, table 1.
a. Rated on a scale from 1 to 10. 520 Note that the sales data for both the LU and non-LU projects are forecasts. To what extent can we rely on these? We explored this matter by collecting both forecast and actual sales data from five 3M division controllers. (Division controllers are responsible for authorizing new product-development investment expenditures.) We also obtained data from a 1995 internal study that compared 3M's sales forecasts with actual sales. We combined this information to develop a distribution of forecast errors for a number of 3M divisions, as well as overall forecast errors across the entire corporation. Those errors range from forecast/actual of +30 percent (over-forecast) to --13 percent (underforecast). On the basis of the information just described, and in consultation with 3M management, we deflated all sales forecast data by 25 percent. That deflator is consistent with 3M's historical experience and, we think, provides conservative sales forecasts.17 Deflated data appear in table 10.1 and in the following tables. 17 In the general literature, Armstrong's (2001) review on forecast bias for new product introduction indicates that sales forecasts are generally optimistic, but that that upward bias decreases as the magnitude of the sales forecast increases. Coller and Yohn (1998) review the literature on bias in accuracy of management earnings forecasts and find that little systematic bias occurs. Tull's (1967) model calculates $15 million in revenue as a level above which forecasts actually become pessimistic on average. We think it reasonable to apply the same deflator to LU vs. non-LU project sales projections. Even if LU project personnel were for some reason more likely to be optimistic with respect to such projections than non-LU project personnel, that would not significantly affect our findings. Over 60 percent of the total dollar value of sales forecasts made for LU projects were actually made by personnel not associated with those projects (outside consulting firms or business analysts from other divisions). 521 Rather strikingly, all five of the funded 3M lead user projects created the basis for major new product lines for 3M (table 10.2). In contrast, 41 of 42 funded product concepts generated by non-LU methods were improvements or extensions of existing product lines (χ2 test, p < 0.005). 522 Following tt, p < 0.005).e advice of 3M divisional controllers, major product lines were defined as those separately reported in divisional financial statements. In 1999 in the 3M divisions we studied, sales of individual major product lines ranged from 7 percent to 73 percent of total divisional sales. The sales projections for funded lead user project ideas all fell well above the lower end of this range: projected sales five years after introduction for funded LU ideas, conservatively deflated as discussed above, ranged from 25 percent to over 300 percent of current total divisional sales. 523 Table 10.2 Lead user project teams developed concepts for major new product lines. Non-lead-user project teams developed concepts for incremental product improvements. 524
Incremental product improvementsMajor new product lines
LU method05
Non-LU method411
 525 Source: Lilien et al. 2002, table 2. 526 To illustrate what the major product line innovations that the LU process teams generated at 3M were like, I briefly describe four (one is not described for 3M proprietary reasons): 527 A new approach to the prevention of infections associated with surgical operations. The new approach replaced the traditional "one size fits all" approach to infection prevention with a portfolio of patient-specific measures based on each patient's individual biological susceptibilities. This innovation involved new product lines plus related business and strategy innovations made by the team to bring this new approach to market successfully and profitably. _* Electronic test and communication equipment for telephone field repair workers that pioneered the inclusion of audio, video, and remote data access capabilities. These capabilities enabled physically isolated workers to carry out their problem-solving work as a virtual team with co-workers for the first time. 528 A new approach, implemented via novel equipment, to the application of commercial graphics films that cut the time of application from 48 hours to less than 1 hour. (Commercial graphics films are used, for example, to cover entire truck trailers, buses, and other vehicles with advertising or decorative graphics.) The LU team's solutions involved technical innovations plus related channel and business model changes to help diffuse the innovation rapidly. 529 A new approach to protecting fragile items in shipping cartons that replaces packaging materials such as foamed plastic. The new product lines implementing the approach were more environmentally friendly and much faster and more convenient for both shippers and package recipients than other products and methods on the market. 530 Lilien, Morrison, Searls, Sonnack, and I also explored to see whether the major product lines generated by the lead user projects had characteristics similar to those of the major product lines that had been developed at 3M in the past, including Scotch Tape. To determine this we collected data on all major new product lines introduced to the market between 1950 and 2000 by the five 3M divisions that had executed one or more lead user studies. (The year 1950 was as far back as we could go and still find company employees who could provide some data about the innovation histories of these major products lines.) Examples from our 1950--2000 sample include the following: 531 Scotch Tape: A line of transparent mending tapes that was first of its type and a major success in many household and commercial applications. 532 Disposable patient drapes for operating room use: A pioneering line of disposable products for the medical field now sold in many variations. 533 Box sealing tapes: The first type of tape strong enough to reliably seal corrugated shipping boxes, it replaced stapling in most "corrugated shipper" applications. 534 Commercial graphics films: Plastic films capable of withstanding outdoor environments that could be printed upon and adhered to large surfaces on vehicles such as the sides of trailer trucks. This product line changed the entire approach to outdoor signage. 535 Table 10.3 provides profiles of the five LU major product lines and the 16 non-LU major product lines for which we were able to collect data. As can be seen, innovations generated with inputs from lead users are similar in many ways to the major innovations developed by 3M in the past. 536 Table 10.3 Major new product lines (MNPLs) generated by lead-user methods are similar to MNPLs generated by 3M in the past. 537
LU MNPLs (n = 5)Past 3M MNPLs (n = 16)Significance
Novelty a compared with competition9.68.00.21
Originality/newness of customer needs addresseda8.37.90.78
% market share in year 568%61%0.76
Estimated sales in year 5 (deflated for forecast error)146mb$62mb0.04
Potential for entire product familya10.09.40.38
Operating profit22%27%0.41
Probability of success80%87%0.35
Strategic importance*9.68.50.39
Intellectual property protectiona7.17.40.81
Fit with distribution channelsa8.88.40.77
Fit with manufacturing capabilitiesa7.86.70.53
Fit with strategic plana9.88.70.32
 538 Source: Lilien et al. 2002, table 4.
a. Measured on a scale from 1 to 10.
b. Five-year sales forecasts for all major product lines commercialized in 1994 or later (5 LU and 2 non-LU major product lines) have been deflated by 25% in line with 3M historical forecast error experience (see text). Five-year sales figures for major product lines commercialized before 1994 are actual historical sales data. This data has been converted to 1999 dollars using the Consumer Price Index from the Economic Report of the President (Council of Economic Advisors 2000). 539 Discussion 540 The performance comparison between lead user and "find a need and fill it" idea-generation projects at 3M showed remarkably strong advantages associated with searching for ideas among lead users in advanced analog fields with needs similar to, but even more extreme than, needs encountered in the intended target market. The direction of this outcome is supported by findings from three other real-world industrial applications of lead user idea-generation methods that studied lead users in the target market but not in advanced analog markets. I briefly describe these three studies next. They each appear to have generated primarily next-generation products--- valuable for firms, but not the basis for radically new major product lines. 541 Recall that Urban and von Hippel (1988) tested the relative commercial attractiveness of product concepts developed in the field of computer-aided systems for the design of printed circuit boards (PC-CAD). One of the concepts they tested contained novel features proposed by lead users that had innovated in the PC-CAD field in order to serve in-house need. The attractiveness of the "lead user concept" was then evaluated by a sample of 173 target-market users of PC-CAD systems relative to three other concept choices---one of which was a description of the best system then commercially available. Over 80 percent of the target-market users were found to prefer the concept incorporating the features developed by innovating lead users. Their reported purchase probability for a PC-CAD system incorporating the lead user features was 51 percent, over twice as high as the purchase probability indicated for any other system. The target-market users were also found willing to pay twice as much for a product embodying the lead user features than for PC-CAD products that did not incorporate them. 542 Herstatt and von Hippel (1992) documented a lead user project seeking to develop a new line of pipe hangers---hardware used to attach pipes to the ceilings of commercial buildings. Hilti, a major manufacturer of construction-related equipment and products, conducted the project. The firm introduced a new line of pipe hanger products based on the lead user concept and a post-study evaluation has shown that this line has become a major commercial success for Hilti. 543 Olson and Bakke (2001) report on two lead user studies carried out by Cinet, a leading IT systems integrator in Norway, for the firm's two major product areas, desktop personal computers, and Symfoni application GroupWare. These projects were very successful, with most of the ideas incorporated into next-generation products having been collected from lead users. 544 Active search for lead users that have innovated enables manufacturers to more rapidly commercialize lead user innovations. One might think that an alternative approach would be to identify lead users before they have innovated. Alert manufacturers could then make some prior arrangements to get preferred access to promising user-developed innovations by, for example, purchasing promising lead user organizations. I myself think that such vertical integration approaches are not practical. As was shown earlier, the character and attractiveness of innovations lead users may develop is based in part on the particular situations faced by and information stocks held by individual lead users. User innovation is therefore likely to be a widely distributed phenomenon, and it would be difficult to predict in advance which users are most likely to develop very valuable innovations. 545 How do we square these findings with the arguments, put forth by Christensen (1997), by Slater and Narver (1998), and by others, that firms are likely to miss radical or disruptive innovations if they pay close attention to requests from their customers? Christensen (1997, p. 59, n. 21) writes: "The research of Eric von Hippel, frequently cited as evidence of the value of listening to customers, indicates that customers originate a large majority of new product ideas. . . . The [Christensen] value network framework would predict that the innovations toward which the customers in von Hippel's study led their suppliers would have been sustaining innovations. We would expect disruptive innovations to have come from other sources." 546 Unfortunately, the above contains a basic misunderstanding of my research findings. My findings, and related findings by others as well, deal with innovations by lead users, not customers, and lead users are a much broader category than customers of a specific firm. Lead users that generate innovations of interest to manufacturers can reside, as we have seen, at the leading edges of target markets, and also in advanced analog markets. The innovations that some lead users develop are certainly disruptive from the viewpoint of some manufacturers---but the lead users are unlikely to care about this. After all, they are developing products to serve their own needs. Tim Berners-Lee, for example, developed the World Wide Web as a lead user working at CERN---a user of that software. The World Wide Web was certainly disruptive to the business models of many firms, but this was not Berners-Lee's concern. Lead users typically have no reason to lead, mislead, or even contact manufacturers that might eventually benefit from or be disrupted by their innovations. Indeed, the likely absence of a preexisting customer relationship is the reason that manufacturing firms must search for lead user innovations outside their customer lists---as 3M did in its lead user idea generation studies. "Listening to the voice of the customer" is not the same thing as seeking out and learning from lead users (Danneels 2004). 547 That basic misunderstanding aside, I do agree with Christensen and others that a manufacturer may well receive mainly requests for sustaining innovations from its customers. As was discussed in chapter 4, manufacturers have an incentive to develop innovations that utilize their existing capabilities---that are "sustaining" for them. Customers know this and, when considering switching to a new technology, are unlikely to request it from a manufacturer that would consider it to be disruptive: they know that such a manufacturer is unlikely to respond positively. The net result is that manufacturers' inputs from their existing customers may indeed be biased towards requests for sustaining innovations. 548 I conclude this chapter by reminding the reader that studies of the sources of innovation show clearly that users will tend to develop some types of innovations but not all. It therefore makes sense for manufacturers to partition their product-development strategies and portfolios accordingly. They may wish, for example, to move away from actual new product development and search for lead users' innovations in the case of functionally novel products. At the same time manufacturers may decide to continue to develop products that do not require high-fidelity models of need information and use environments to get right. One notable category of innovations with this characteristic is dimension-of-merit improvements to existing products. Sometimes users state their needs for improved products in terms of dimensions on which improvements are desired---dimensions of merit. As an example, consider that users may say "I want a computer that is as fast and cheap as possible." Similarly, users of medical imaging equipment may say "I want an image that is of as high a resolution as is technically possible." If manufacturers (or users) cannot get to the end point desired by these users right away, they will instead progressively introduce new product generations that move along the dimension of merit as rapidly and well as they can. Their rate of progress is determined by the rate at which solution technologies improve over time. This means that sticky solution information rather than sticky need information is central to development of dimension-of-merit improvements. Manufacturers will tend to have the information they need to develop dimension of merit innovations internally. 549 11 Application: Toolkits for User Innovation and Custom Design 550 An improved understanding of the relative innovation capabilities of users and manufacturers can enable designs for more effective joint innovation processes. Toolkits for user innovation and custom design illustrate this possibility. In this new innovation process design, manufacturers actually abandon their efforts to understand users' needs accurately and in detail. Instead, they outsource only need-related innovation tasks to their users, who are equipped with appropriate toolkits. This process change differs from the lead user search processes discussed earlier in an interesting way. Lead user searchs identify existing innovations, but do nothing to change the conditions affecting user-innovators at the time a new product or service is being developed. Toolkits for users, in contrast, do change the conditions potential innovators face. By making innovation cheaper and quicker for users, they can increase the volume of user innovation. They also can channel innovative effort into directions supported by toolkits. 551 In this chapter, I first explore why toolkits are useful. Next, I describe how to create an appropriate setting for toolkits and how toolkits function in detail. Finally, I discuss the conditions under which toolkits are likely to be of most value. 552 Benefits from Toolkits 553 Toolkits for user innovation and design are integrated sets of product-design, prototyping, and design-testing tools intended for use by end users. The goal of a toolkit is to enable non-specialist users to design high-quality, producible custom products that exactly meet their needs. Toolkits often contain "user-friendly" features that guide users as they work. They are specific to a type of product or service and a specific production system. For example, a toolkit provided to customers interested in designing their own, custom digital semiconductor chips is tailored precisely for that purpose--- it cannot be used to design other types of products. Users apply a toolkit in conjunction with their rich understanding of their own needs to create a preliminary design, simulate or prototype it, evaluate its functioning in their own use environment, and then iteratively improve it until they are satisfied. 554 A variety of manufacturers have found it profitable to shift the tasks of custom product design to their customers along with appropriate toolkits for innovation. Results to date in the custom semiconductor field show development time cut by 2/3 or more for products of equivalent complexity and development costs cut significantly as well via the use of toolkits. In 2000, more than $15 billion worth of custom integrated circuits were sold that had been designed with the aid of toolkits---often by circuit users---and produced in the "silicon foundries" of custom semiconductor manufacturers such as LSI (Thomke and von Hippel 2002). International Flavors and Fragrances (IFF), a global supplier of specialty flavors to the food industry, has built a toolkit that enables its customers to modify flavors for themselves, which IFF then manufactures. In the materials field, GE provides customers with Web-based tools for designing better plastic products. In software, a number of consumer product companies provide toolkits that allow people to add custom-designed modules to their standard products. For example, Westwood Studios provides its customers with toolkits that enable them to design important elements of their own video games (Jeppesen 2005). 555 The primary function of toolkits for user design is to co-locate product-development and service-development tasks with the sticky information needed to execute them. Need-intensive tasks involved in developing a particular type of product or service are assigned to users, along with the tools needed to carry those tasks out. At the same time, solution-intensive tasks are assigned to manufacturers. 556 As was discussed in chapter 5, problem solving in general, and product and service development in particular, is carried out via repeated cycles of learning by trial and error. When each cycle of a trial-and-error process requires access to sticky information located at more than one site, colocation of problem-solving activity with sticky information is achieved by repeatedly shifting problem solving to the relevant sticky information sites as product development proceeds. 557 For example, suppose that need information is sticky at the site of the potential product user and that solution information is sticky at the site of the manufacturer. A user may initiate a development project by drawing on local user-need information to specify a desired new product or service (figure 11.1). This information is likely to be sticky at least in part. Therefore, the user, even when exerting best efforts, will supply only partial and partially correct need and use-context information to the manufacturer. The manufacturer then applies its solution information to the partially accurate user information and creates a prototype that it thinks is responsive to the need and sends it to the user for testing. If the prototype is not satisfactory (and it often is not), the product is returned to the manufacturer for refinement. Typically, as empirical studies show (Tyre and von Hippel 1997; Kristensen 1992), sites of sticky need and / or solution information are repeatedly revisited as problem solvers strive to reach a satisfactory product design (figure 11.2). 558 [di_evh_f11-1.png] 559 Figure 11.1 560 [di_evh_f11-2.png] 561 Figure 11.2 562 Explicit management of user-manufacturer iterations has been built into a number of modern product-development processes. In the rapid application development method (Martin 1991), manufacturers learn to respond to initial user need inputs by quickly developing a partial prototype of a planned product containing the features likely to be most important to users. They deliver this to users, who apply it in their own setting to clarify their needs. Users then relay requests for changes or new features to the product developers, and this process is repeated until an acceptable fit between need and solution is found. Such iteration has been found to "better satisfy true user requirements and produce information and functionality that is more complete, more accurate, and more meaningful" (Connell and Shafer 1989). 563 Even with careful management, however, iterative shifts in problem solving between users and manufacturer-based developers involve significant coordination costs. For example, a manufacturer's development team may be assigned to other tasks while it waits for user feedback, and so will not be immediately able to resume work on a project when needed feedback is received. It would be much better still to eliminate the need for cross-boundary iteration between user and manufacturer sites during product development, and this is what toolkits for user design are intended to do. The basic idea behind toolkits for user design is, as was mentioned earlier, to partition an overall product-development task into subproblems, each drawing on only one locus of sticky information. Then, each task is assigned to the party already having the sticky information needed to solve it. In this approach, both the user and the manufacturer still engage in iterative, trial-and-error problem solving to solve the problems assigned to them. But this iteration is internal to each party---no costly and time-consuming cross-boundary iteration between user and manufacturer is required (von Hippel 1998, 2001; Thomke and von Hippel 2002; von Hippel and Katz 2002). 564 To appreciate the major advantage in problem-solving speed and efficiency that concentrating problem solving within a single locus can create, consider a familiar example: the contrast between conducting financial strategy development with and without "user-operated" financial spreadsheet software: 565 Before the development of easy-to-use financial spreadsheet programs such as Lotus 1-2-3 and Microsoft Excel, a firm's chief financial officer might have carried out a financial strategy development exercise as follows. First, the CFO would have asked an assistant to develop an analysis incorporating a list of assumptions. A few hours or days might elapse before the result was delivered. Then the CFO would use her rich understanding of the firm and its goals to study the analysis. She would typically almost immediately spot some implications of the patterns developed, and would then ask for additional analyses to explore these implications. The assistant would take the new instructions and go back to work while the CFO switched to another task. When the assistant returned, the cycle would repeat until a satisfactory outcome was found. 566 After the development of financial spreadsheet programs, a CFO might begin an analysis by asking an assistant to load up a spreadsheet with corporate data. The CFO would then "play with" the data, trying out various ideas and possibilities and "what if" scenarios. The cycle time between trials would be reduced from days or hours to minutes. The CFO's full, rich information would be applied immediately to the effects of each trial. Unexpected patterns---suggestive to the CFO but often meaningless to a less knowledgeable assistant---would be immediately identified and explored further. 567 It is generally acknowledged that spreadsheet software that enables expert users to "do it themselves" has led to better outcomes that are achieved faster (Levy 1984; Schrage 2000). The advantages are similar in the case of product and service development. Learning by doing via trial and error still occurs, of course, but the cycle time is much faster because the complete cycle of need-related learning is carried out at a single (user) site earlier in the development process. 568 Repartitioning of Development Tasks 569 To create the setting for a toolkit, one must partition the tasks of product development to concentrate need-related information in some and solution-related information in others. This can involve fundamental changes to the underlying architecture of a product or service. As illustration, I first discuss the repartioning of the tasks involved in custom semiconductor chip development. Then, I show how the same principles can be applied in the less technical context of custom food design. 570 Traditionally, fully customized integrated circuits were developed in an iterative process like that illustrated in figure 11.1. The process began with a user specifying the functions that the custom chip was to perform to a manufacturer of integrated circuits. The chip would then be designed by manufacturer employees, and an (expensive) prototype would be produced and sent to the user. Testing by the user would typically reveal faults in the chip and/or in the initial specification, responsive changes would be made, a new prototype would be built. This cycle would continue until the user was satisfied. In this traditional manufacturer-centered development process, manufacturers' development engineers typically incorporated need-related information into the design of both the fundamental elements of a circuit--- such as transistors, and the electrical "wiring" that interconnected those elements into a functioning circuit. 571 The brilliant insight that allowed custom design of integrated circuits to be partitioned into solution-related and need-related subtasks was made by Mead and Conway (1980). They determined that the design of a digital chip's fundamental elements, such as its transistors, could be made standard for all circuits. This subtask required rich access to the manufacturer's sticky solution information regarding how semiconductors are fabricated, but did not require detailed information on users' specific needs. It could therefore be assigned to manufacturer-based chip-design and chip-fabrication engineers. It was also observed that the subtask of interconnecting standard circuit elements into a functioning integrated circuit required only sticky, need-related information about a chip's function---for example, whether it was to function as a microprocessor for a calculator or as a voice chip for a robotic dog. This subtask was therefore assigned to users along with a toolkit that enabled them to do it properly. In sum, this new type of chip, called a gate array, had a novel architecture created specifically to separate the problem-solving tasks requiring access to a manufacturer's sticky solution information from those requiring access to users' sticky need information. 572 The same basic principle can be illustrated in a less technical context: food design. In this field, manufacturer-based designers have traditionally undertaken the entire job of developing a novel food, and so they have freely blended need-specific design into any or all of the recipe-design elements wherever convenient. For example, manufacturer-based developers might find it convenient to create a novel cake by both designing a novel flavor and texture for the cake body, and designing a complementary novel flavor and texture into the frosting. However, it is possible to repartition these same tasks so that only a few draw on need-related information, and these can then be more easily transferred to users. 573 The architecture of the pizza pie illustrates how this can be done. Many aspects of the design of a pizza, such as the dough and the sauce, have been made standard. User choice has been restricted to a single task: the design of toppings. In other words, all need-related information that is unique to a particular user has been linked to the toppings-design task only. Transfer of this single design task to users can still potentially offer creative individuals a very large design space to play in (although pizza shops typically restrict it sharply). Any edible ingredient one can think of, from eye of newt to edible flowers, is a potential topping component. But the fact that need-related information has been concentrated within only a single product-design task makes it much easier to transfer design freedom to the user. 574 The Functionality of Toolkits 575 If a manufacturer outsources need-intensive design tasks to users, it must also make sure that users have the information they need to carry out those tasks effectively. This can be done via a toolkit for user innovation. Toolkits are not new as a general concept---every manufacturer equips its own engineers with a set of tools suitable for developing the type of products or services it wishes to produce. Toolkits for users also are not new---many users have personal collections of tools that they have assembled to help them create new items or modify standard ones. For example, some users have woodworking tools ranging from saws to glue which can be used to create or modify furniture---in very novel or very standard ways. Others may have a kit of software tools needed to create or modify software. What is new, however, is integrated toolkits enabling users to create and test designs for custom products or services that can then be produced "as is" by manufacturers. 576 Present practice dictates that a high-quality toolkit for user innovation will have five important attributes. (1) It will enable users to carry out complete cycles of trial-and-error learning. (2) It will offer users a solution space that encompasses the designs they want to create. (3) It will be user friendly in the sense of being operable with little specialized training. (4) It will contain libraries of commonly used modules that users can incorporate into custom designs. (5) It will ensure that custom products and services designed by users will be producible on a manufacturer's' production equipment without modification by the manufacturer. 577 Learning through Trial and Error 578 It is crucial that user toolkits for innovation enable users to go through complete trial-and-error cycles as they create their designs. Recall that trial-and-error problem solving is essential to product development. For example, suppose that a user is designing a new custom telephone answering system for her firm, using a software-based computer-telephony integration (CTI) design toolkit provided by a vendor. Suppose also that the user decides to include a new rule to "route all calls of X nature to Joe" in her design. A properly designed toolkit would allow her to temporarily place the new rule into the telephone system software, so that she could actually try it out (via a real test or a simulation) and see what happened. She might discover that the solution worked perfectly. Or she might find that the new rule caused some unexpected form of trouble---for example, Joe might be flooded with too many calls---in which case it would be "back to the drawing board" for another design and another trial. 579 In the same way, toolkits for innovation in the semiconductor design field allow users to design a circuit that they think will meet their needs and then test the design by "running" it in the form of a computer simulation. This quickly reveals errors that the user can then quickly and cheaply fix using toolkit-supplied diagnostic and design tools. For example, a user might discover by testing a simulated circuit design that a switch needed to adjust the circuit had been forgotten and make that discovery simply by trying to make a needed adjustment. The user could then quickly and cheaply design in the needed switch without major cost or delay. 580 One can appreciate the importance of giving the user the capability for trial-and-error learning by doing in a toolkit by thinking about the consequences of not having it. When users are not supplied with toolkits that enable them to draw on their local, sticky information and engage in trial-and-error learning, they must actually order a product and have it built to learn about design errors---typically a very costly and unsatisfactory way to proceed. For example, automobile manufacturers allow customers to select a range of options for their cars, but they do not offer the customer a way to learn during the design process and before buying. The cost to the customer is unexpected learning that comes too late: "That wide-tire option did look great in the picture. But now that the car has been delivered, I discover that I don't like the effect on handling. Worse, I find that my car is too wide to fit into my garage!" 581 Similar disasters are often encountered by purchasers of custom computers. Many custom computer manufacturers offer a website that allows users to "design your own computer online." However, these websites do not allow users to engage in trial-and-error design. Instead, they simply allow users to select computer components such as processor chips and disk drives from lists of available options. Once these selections have been made, the design transaction is complete and the computer is built and shipped. The user has no way to test the functional effects of these choices before purchase and first field use---followed by celebration or regret. 582 In contrast, a sophisticated toolkit for user innovation would allow the user to conduct trial-and-error tests to evaluate the effects of initial choices made and to improve on them. For example, a computer design site could add this capability by enabling users to actually test and evaluate the hardware configuration they specify on their own programs and computing tasks before buying. To do this, the site might, for example, provide access to a remote computer able to simulate the operation of the computer that the user has specified, and provide performance diagnostics and related choices in terms meaningful to the user (e.g., "If you add option x at cost y, the time it takes to complete your task will decrease by z seconds"). The user could then modify or confirm initial design choices according to trade-off preferences only he or she knows. 583 Appropriate Solution Spaces 584 Economical production of custom products and services is achievable only when a custom design falls within the pre-existing capability and degrees of freedom built into a particular manufacturer's production system. My colleagues and I call this the solution space offered by that system. A solution space may vary from very large to small, and if the output of a toolkit is tied to a particular production system, then the design freedom that a toolkit can offer a user will be accordingly large or small. For example, the solution space offered by the production process of a manufacturer of custom integrated circuits offers a huge solution space to users---it will produce any combination of logic elements interconnected in any way that a user-designer might desire, with the result that the user can invent anything from a novel type of computer processor to a novel silicon organism within that space. However, note that the semiconductor production process also has stringent limits. It will only implement product designs expressed in terms of semiconductor logic---it will not implement designs for bicycles or houses. Also, even within the arena of semiconductors, it will only be able to produce semiconductors that fit within a certain range with respect to size and other properties. Another example of a production system offering a very large solution space to designers---and, potentially to user-designers via toolkits---is the automated machining center. Such a device can basically fashion any shape out of any machinable material that can be created by any combination of basic machining operations such as drilling and milling. As a consequence, toolkits for innovation intended to create designs that can be produced by automated machining centers can offer users access to that very large solution space. 585 Large solution spaces can typically be made available to user-designers when production systems and associated toolkits allow users to manipulate and combine relatively basic and general-purpose building blocks and operations, as in the examples above. In contrast, small solution spaces typically result when users are only allowed to combine a relatively few pre-designed options. Thus, users who want to design their own custom automobiles are restricted to a relatively small solution space: they can only make choices from lists of options regarding such things as engines, transmissions, and paint colors. Similarly, purchasers of eyeglasses are restricted to combining "any frame from this list" of pre-designed frames, with "any lens type from that list" of pre-designed options. 586 The reason producers of custom products or services enforce constraints on the solution space that user-designers may use is that custom products can be produced at reasonable prices only when custom user designs can be implemented by simply making low-cost adjustments to the production process. This condition is met within the solution space on offer. However, responding to requests that fall outside that space will require small or large additional investments by the manufacturer. For example, a producer of integrated circuits may have to invest many millions of dollars and rework an entire production process in order to respond to a customer's request for a larger chip that falls outside the solution space associated with its present production equipment. 587 User-Friendly Tools 588 User toolkits for innovation are most effective and successful when they are made "user friendly" by enabling users to use the skills they already have and to work in their own customary and well-practiced design language. This means that users don't have to learn the---typically different---design skills and language customarily used by manufacturer-based designers, and so they will require much less training to use the toolkit effectively. 589 For example, in the case of custom integrated circuit design, the users of toolkits are typically electrical engineers who are designing electronic systems that will incorporate custom semiconductor chips. The digital design language normally used by electrical engineers is Boolean algebra. Therefore, user-friendly toolkits for custom semiconductor design are provided that allow toolkit users to design in this language. That is, users can create a design, test how it works, and make improvements using only their own, customary design language. At the conclusion of the design process, the toolkit then translates the user's logical design into the design inputs required by the semiconductor manufacturer's production system. 590 A design toolkit based on a language and skills and tools familiar to the user is only possible to the extent that the user has familiarity with some appropriate and reasonably complete language and set of skills and tools. Interestingly, this is the case more frequently than one might initially suppose, at least in terms of the function that a user wants a product or service to perform---because functionality is the face that the product or a service presents to the user. (Indeed, an expert user of a product or service may be much more familiar with that functional face than manufacturer-based experts.) Thus, the user of a custom semiconductor is the expert in what he or she wants that custom chip to do, and is skilled at making complex tradeoffs among familiar functional elements to achieve a desired end: "If I increase chip clock speed, I can reduce the size of my cache memory and. . . ." 591 As a less technical example, consider the matter of designing a custom hairstyle. There is certainly a great deal of information known to hairstylists that even an expert user may not know, such as how to achieve a certain look by means of layer cutting, or how to achieve a certain streaked color pattern by selectively dying some strands of hair. However, an expert user is often very well practiced at the skill of examining the shape of his or her face and hairstyle as reflected in a mirror, and visualizing specific improvements that might be desirable in matters such as curls, shape, or color. In addition, the user will be very familiar with the nature and functioning of everyday tools used to shape hair, such as scissors and combs. 592 A user-friendly toolkit for hairstyling innovation can be built upon these familiar skills and tools. For example, a user can be invited to sit in front of a computer monitor, and study an image of her face and hairstyle as captured by a video camera. Then, she can select from a palette of colors and color patterns offered on the screen, can superimpose the effect on her existing hairstyle, can examine it, and can repeatedly modify it in a process of trial-and-error learning. Similarly, the user can select and manipulate images of familiar tools, such as combs and scissors, to alter the image of the length and shape of her own hairstyle as projected on the computer screen, can study and further modify the result achieved, and so forth. Note that the user's new design can be as radically new as is desired, because the toolkit gives the user access to the most basic hairstyling variables and tools such as hair color and scissors. When the user is satisfied, the completed design can be translated into technical hairstyling instructions in the language of a hairstyling specialist---the intended production system in this instance. 593 In general, steady improvements in computer hardware and software are enabling toolkit designers to provide information to users in increasingly friendly ways. In earlier days, information was often provided to users in the form of specification sheets or books. The user was then required to know when a particular bit of information was relevant to a development project, find the book, and look it up. Today, a large range of potentially needed information can be embedded in a computerized toolkit, which is programmed to offer the user items of information only if and as a development being worked on makes them relevant. 594 Module Libraries 595 Custom designs seldom are novel in all their parts. Therefore, a library of standard modules will be a valuable part of a toolkit for user innovation. Provision of such standard modules enables users to focus their creative work on those aspects of their product or service designs that cannot be implemented via pre-designed options. For example, architects will find it very useful to have access to a library of standard components, such as a range of standard structural support columns with pre-analyzed structural characteristics, that they can incorporate into their novel building designs. Similarly, users who want to design custom hairstyles will often find it helpful to begin by selecting a hairstyle from a toolkit library. The goal is to select a style that has some elements of the desired look. Users can then proceed to develop their own desired style by adding to and subtracting from that starting point. 596 Translating Users' Designs for Production 597 The "language" of a toolkit for user innovation must be convertible without error into the language of the intended production system at the conclusion of the user's design work. If it is not, the entire purpose of the toolkit will be lost---because a manufacturer receiving a user design will essentially have to do the design work over again. Error-free translation need not emerge as a major problem---for example, it was never a major problem during the development of toolkits for integrated circuit design, because both chip designers and chip producers already used a language based on digital logic. In contrast, in some fields, translating from the design language preferred by users to the language required by intended production systems can be the central problem in toolkit design. As an illustration, consider a recent toolkit test project managed by Ernie Gum, the Director of Food Product Development for the USA FoodServices Division of Nestlé. 598 One major business of Nestlé FoodServices is producing custom food products, such as custom Mexican sauces, for major restaurant chains. Custom foods of this type have traditionally been developed by or modified by the chains' executive chefs, using what are in effect design and production toolkits taught by culinary schools: recipe development procedures based on food ingredients available to individuals and restaurants, and processed with restaurant-style equipment. After using their traditional toolkits to develop or modify a recipe for a new menu item, executive chefs call in Nestlé Foodservices or another custom food producer and ask that firm to manufacture the product they have designed---and this is where the language translation problem rears its head. 599 There is no error-free way to translate a recipe expressed in the language of a traditional restaurant-style culinary toolkit into the language required by a food-manufacturing facility. Food factories must use ingredients that can be obtained in quantity at consistent quality. These are not the same as, and may not taste quite the same as, the ingredients used by the executive chef during recipe development. Also, food factories use volume production equipment, such as huge-steam-heated retorts. Such equipment is very different from restaurant-style stoves and pots and pans, and it often cannot reproduce the cooking conditions created by the executive chef on a stove-top---for example, very rapid heating. Therefore, food-production factories cannot simply produce a recipe developed by or modified by an executive chef "as is" under factory conditions---it will not taste the same. 600 As a consequence, even though an executive chef creates a prototype product using a traditional chef's toolkit, food manufacturers find most of that information---the information about ingredients and processing conditions---useless because it cannot be straightforwardly translated into factory-relevant terms. The only information that can be salvaged is the information about taste and texture contained in the prototype. And so, production chefs carefully examine and taste the customer's custom food prototype, then try to make something that tastes the same using factory ingredients and methods. But an executive chef's taste buds are not necessarily the same as production chef taste buds, and so the initial factory version---and the second and the third---is typically not what the customer wants. So the producer must create variation after variation until the customer is finally satisfied. 601 To solve the translation problem, Gum created a novel toolkit of pre-processed food ingredients to be used by executive chefs during food development. Each ingredient in the toolkit was the Nestlé factory version of an ingredient traditionally used by chefs during recipe development: That is, it was an ingredient commercially available to Nestlé that had been processed as an independent ingredient on Nestlé factory equipment. Thus, a toolkit designed for developing Mexican sauces would contain a chili puree ingredient processed on industrial equipment identical to that used to produce food in commercial-size lots. (Each ingredient in such a toolkit also contains traces of materials that will interact during production---for example, traces of tomato are included in the chili puree---so that the taste effects of such interactions will also be apparent to toolkit users.) 602 Chefs interested in using the Nestlé toolkit to prototype a novel Mexican sauce would receive a set of 20--30 ingredients, each in a separate plastic pouch. They would also be given instructions for the proper use of these ingredients. Toolkit users would then find that each component differs slightly from the fresh components he or she is used to. But such differences are discovered immediately through direct experience. The chef can then adjust ingredients and proportions to move to the desired final taste and texture that is desired. When a recipe based on toolkit components is finished, it can be immediately and precisely reproduced by Nestlé factories--- because now the executive chef is using the same language as the factory. In the Nestlé case, field testing by Food Product Development Department researchers showed that adding the error-free translation feature to toolkit-based design by users reduced the time of custom food development from 26 weeks to 3 weeks by eliminating repeated redesign and refinement interactions between Nestlé and purchasers of its custom food products. 603 Discussion 604 A toolkit's success in the market is significantly correlated with that toolkit's quality and with industry conditions. Thus, Prýgl and Franke (2005) studied the success of 100 toolkits offered in a single industry: computer gaming. They found that success, evaluated by independent experts, was significantly correlated with the quality of execution of the attributes of toolkits that have been discussed in this chapter. That is, success was found to be significantly affected by the quality of trial-and-error learning enabled by a toolkit, by the quality of fit of the solution space offered to users' design problems, by the user friendliness of the tools provided, and by the quality of module libraries offered with the toolkit. Schreier and Franke (2004) also obtained information on the importance of toolkit quality in a study of the value that users placed on consumer products (scarves, T shirts, cell phone covers) customized with a simple, manufacturer-supplied toolkit. They found user willingness to pay for custom designs, as measured by Vickrey auctions, was significantly negatively affected by the difficulty of creating custom designs with a toolkit. In contrast, willingness to pay was significantly positively affected by enjoyment experienced in using a toolkit. 605 With respect to industry and market conditions, the toolkit-for-user innovation approach to product design is likely to be most appealing to toolkit suppliers when the heterogeneous needs of many users can be addressed by a standard solution approach encoded in a toolkit. This is because it can be costly to encode all the solution and production information relevant to users' design decisions. For example, a toolkit for custom semiconductor design must contain information about the semi-conductor production process needed to ensure that product designs created by users are in fact producible. Encoding such information is a one-time cost, so it makes the best economic sense for solution approaches that many will want to use. 606 Toolkits for user innovation are not an appropriate solution for all product needs, even when heterogeneous needs can be addressed by a common solution approach. Specifically, toolkits will not be the preferred approach when the product being designed requires the highest achievable performance. Toolkits incorporate automated design rules that cannot, at least at present, translate designs into products or software as skillfully as a human designer can. For example, a design for a gate array generated with a toolkit will typically take up more physical space on a silicon chip than would a fully custom-developed design of similar complexity. Even when toolkits are on offer, therefore, manufacturers may continue to design certain products (those with difficult technical demands) while customers take over the design of others (those involving complex or rapidly evolving user needs). 607 Toolkits can be designed to offer a range of capabilities to users. At the high end, with toolkits such as those used to design custom integrated circuits, users can truly innovate, creating anything implementable in digital electronics, from a dishwasher controller to a novel supercomputer or form of artificial life. At the low end, the product configurators commonly offered by manufacturers of mass-customized products enable, for example, a watch purchaser to create a custom watch by selecting from lists of pre-designed faces, hands, cases, and straps. (Mass-customized production systems can manufacture a range of product variations in single-unit quantities at near mass-production costs (Pine 1993). In the United States, production systems used by these manufacturers are generally based on computerized production equipment.) 608 The design freedom provided by toolkits for user innovation may not be of interest to all or even to most users in a market characterized by heterogeneous needs. A user must have a great enough need for something different to offset the costs of putting a toolkit to use for that approach to be of interest. Toolkits may therefore be offered only to a subset of users. In the case of software, toolkits may be provided to all users along with a standard, default version of the product or service, because the cost of delivering the extra software is essentially zero. In such a case, the toolkit's capability will simply lie unused in the background unless and until a user has sufficient incentive to evoke and employ it. 609 Provision of toolkits to customers can be a complement to lead user idea-generation methods for manufacturers. Some users choosing to employ a toolkit to design a product precisely right for their own needs will be lead users, whose present strong need foreshadows a general need in the market. Manufacturers can find it valuable to identify and acquire the generally useful improvements made by lead users of toolkits, and then supply these to the general market. For this reason, manufacturers may find it valuable implement toolkits for innovation even if the portion of the target market that can directly use them is relatively small. 610 Toolkits can affect existing business models in a field in ways that may or may not be to manufacturers' competitive advantage in the longer run. For example, consider that many manufacturers of products and services profit from both their design capabilities and their production capabilities. A switch to user-based customization via toolkits can affect their ability to do this over the long term. Thus, a manufacturer that is early in introducing a toolkit approach to custom product or service design may initially gain an advantage by tying that toolkit to its particular production facility. However, when toolkits are made available to customer designers, this tie often weakens over time. Customers and independent tool developers can eventually learn to design toolkits applicable to the processes of several manufacturers. Indeed, this is precisely what has happened in the custom integrated circuit industry. The toolkits revealed to users by the initial innovator, LSI, and later by rival producers were producer-specific. Over time, however, Cadance and other specialist toolkit supply firms emerged and developed toolkits that could be used to make designs producible by a number of vendors. The end result is that manufacturers that previously benefited from selling their product-design skills and their production skills can be eventually forced by the shifting of design tasks to customers via toolkits to a position of benefiting from their production skills only. 611 Manufacturers that think long-term disadvantages may accrue from a switch to toolkits for user innovation and design will not necessarily have the luxury of declining to introduce toolkits. If any manufacturer introduces a high-quality toolkit into a field favoring its use, customers will tend to migrate to it, forcing competitors to follow. Therefore, a firm's only real choice in a field where conditions are favorable to the introduction of toolkits may be whether to lead or to follow. 612 12 Linking User Innovation to Other Phenomena and Fields 613 This final chapter is devoted to describing links between user-centered innovation and other phenomena and literatures. Of course, innovation writ large is related to anything and everything, so the phenomena and the literatures I will discuss here are only those hanging closest on the intellectual tree. My goal is to enable interested readers to migrate to further branches as they wish, assisted by the provision of a few important references. With respect to phenomena, I will first point out the relationship of user innovation to information communities---of which user innovation communities are a subset. With respect to related fields, I begin by linking user-centric innovation phenomena explored in this book to the literature on the economics of knowledge, and to the competitive advantage of nations. Next I link it to research on the sociology of technology. Finally, I point out how findings regarding user innovation could---but do not yet---link to and complement the way that product development is taught to managers. 614 Information Communities 615 Many of the considerations I have discussed with respect to user innovation communities apply to information communities as well---a much more general category of which user innovation communities are a subset. I define information communities as communities or networks of individuals and/or organizations that rendezvous around an information commons, a collection of information that is open to all on equal terms. 616 In close analogy to our discussions of innovation communities, I propose that commons-based information communities or networks will form when the following conditions hold: (1) Some have information that is not generally known. (2) Some are willing to freely reveal what they know. (3) Some beyond the information source have uses for what is revealed. On an intuitive basis, one can immediately see that these conditions are often met. Of course, people and firms know different things. Of course there are many things that one would not be averse to freely revealing; and of course others would often be interested in what is freely revealed. After all, as individuals we all regularly freely reveal information not generally known to people who ask, and presumably these people value at least some of the information we provide. 617 The economics of information communities can be much simpler than that of the user innovation communities discussed earlier, because valuable proprietary information is often not at center stage. When the service provided by information communities is to offer non-proprietary "content" in a more convenient and accessible form, one need consider only the costs and benefits associated with information diffusion. One need not also consider potential losses associated with the free revealing of proprietary innovation-related information. 618 It is likely that information communities are getting steadily more pervasive for the same reasons that user innovation communities are: the costs of diffusing information are getting steadily lower as computing and communication technologies improve. As a result, information communities may have a rapidly increasing impact on the economy and on the landscape of industry. They are and will be especially empowering to fragmented groups, whose members may for the first time gain low-cost access to a great deal of rich and fresh information of mutual interest. As is the case for user innovation networks, information networks can actually store content that participants freely reveal and make it available for free downloading. (Wikipedia is an example of this.) And/or, information networks can function to link information seekers and information holders rather than actually storing information. In the latter case, participants post to the network, hoping that someone with the requested information will spot their request and provide an answer (Lakhani and von Hippel 2003). Prominent examples can be found in the medical field in the form of specialized websites where patients with relatively rare conditions can for the first time find each other and also find specialists in those conditions. Patients and specialists who participate in these groups can both provide and get access to information that previously was scattered and for most practical purposes inaccessible. 619 Just as is the case in user innovation groups, open information communities are developing rapidly, and the behaviors and infrastructure needed for success are being increasingly learned and codified. These communities are by no means restricted to user-participants. Thus, both patients and doctors frequently participate in medical information communities. Also, information communities can be run by profit-making firms and/or on a non-profit basis for and by information providers and users themselves--- just as we earlier saw was the case with innovation communities. Firms and users are developing many versions of open information communities and testing them in the market. As an example of a commercially supported information commons, consider e-Bay, where information is freely revealed by many under a structure provided by a commercial firm. The commercial firm then extracts a profit from commissions on transactions consummated between information providers and information seekers. As an example of an information community supported by users themselves, again consider Internet sites specializing in specific diseases---for example, childrenfacingillness.com. 620 Information communities can have major effects on established ways of doing business. For example, markets become more efficient as the information provided to transaction participants improves. Thus, product and service manufacturers benefit from good information on the perceptions and preferences of potential buyers. Similarly, product and service purchasers benefit from good information on the characteristics of the various offerings in the market. Traditionally, firms have collected information on users' needs and on products' characteristics by means of face-to-face interviewing and (in the case of mass markets) questionnaires. Similar information of high quality now can be collected nearly without cost and can be posted on special Internet sites by users themselves and/or by for-profit enterprises. Dellarocas, Awad, and Zhang (2004) show that volunteered online movie reviews provide information that is just as accurate as that collected by surveys of representative samples of respondents. This emerging new approach to data aggregation will clearly affect the established business models of firms specializing in information collection, with websites like www.ciao.co.uk illustrating new possibilities. If the quality of information available to transaction participants goes up and the information price is low, transaction quality should go up. With the aid of online product-evaluation sites, it is likely that consumers will be able to apply much better information even to small buying decisions, such as the choice of a restaurant for tonight's dinner. 621 What Paul David and colleagues call "open science" is a type of information community that is closely related to the innovation communities discussed earlier (David 1992; Dasgupta and David 1994; David 1998). Free revealing of findings is, of course, a characteristic of modern science. Academic scientists publish regularly and so freely reveal information that may have high proprietary value. This raises the same question explored in the case of innovation communities: Why, in view of the potential of free ridership, do scientists freely reveal the information they have developed at private cost? The answer overlaps with but also differs from the answers provided in the case of free revealing of proprietary innovations by innovation users. With respect to similarities, sociologists of science have found that reputation among peers is important to scientists, and that priority in the discovery of new knowledge is a major component of reputation. Because of the importance of priority, scientists generally rush their research projects to completion and then rush to freely reveal their new findings. This dynamic creates a great advantage from the point of view of social welfare (Merton 1973). 622 With respect to major differences, it is public policy in many countries to subsidize research with public funds. These policies are based on the assumption that only inadequate amounts of scientific research can be drawn forth by reputational inducements alone. Recall that, in contrast, innovations developed and freely revealed by innovation users are not subsidized from any source. Users, unlike "scientists," by definition have a personal or corporate use for the innovation-related knowledge they generate. This additional source of private reward may explain why user innovation communities can flourish without subsidy. 623 The Economics of Knowledge 624 In this field, Foray (2004) provides a rich road map regarding the economics of knowledge and the central role played by users. Foray argues that the radical changes in information and communication technologies (ICT) are creating major changes in the economics of knowledge production and distribution. Economists have traditionally reduced knowledge production to the function of research and development, defined as the activity specifically devoted to invention and innovation. Starting with Machlup (1962), economists also have identified the knowledge-based economy as consisting of specialized sectors focused on activities related to communication, education, the media, and computing and information-related services. Foray argues that these simplifications, although providing a rationale for a way to measure knowledge-generation activities, were never appropriate and now are totally misleading. 625 Knowledge generation, Foray says, is now a major activity across all industrial sectors and is by no means restricted to R&D laboratories: we are in the age of the knowledge economy. He makes a central distinction between R&D that is conducted in laboratories remote from doing, and learning by doing at the site of production. He argues that both are important, and have complementary advantages and drawbacks. Laboratory research can ignore some of the complexities involved in production in search of basic understanding. Learning by doing has the contrasting advantage of being in the full fidelity of the real production process. The drawback to learning by doing, however, is that one is attempting to do two things at once---producing and learning---and this can force compromises onto both. 626 Foray positions users at the heart of knowledge production. He says that one major challenge for management is to capture the knowledge being generated by users "on line" during the process of doing and producing, and to integrate it with knowledge created "off line" in laboratories. He discusses implications of the distributed nature of knowledge production among users and others, and notes that the increased capabilities of information and communication technologies tend to reduce innovators' ability to control the knowledge they create. He proposes that the most effective knowledge-management policies and practices will be biased toward knowledge sharing. 627 Weber (2004, pp. 72--73) explores similar ideas in the specific context of open source software. "The conventional language of industrial-era economics," he notes, "identifies producers and consumers, supply and demand. The open source process scrambles these categories. Open source software users are not consumers in the conventional sense. . . . Users integrate into the production process itself in a profound way." Weber's central thesis is that the open source process is a new way of organizing production: 628 One solution is the familiar economy that depends upon a blend of exclusive property rights, divisions of labor, reduction of transaction costs, and the management of principal-agent problems. The success of open source demonstrates the importance of a fundamentally different solution, built on top of an unconventional understanding of property rights configured around distribution. . . . And it relies on a set of organizational structures to coordinate behavior around the problem of managing distributed innovation, which is different from the division of labor. (ibid., p. 224) 629 Weber details the property-rights regime used by open source projects, and also the nature of open source innovation communities and incentives acting on participants. He then argues that this new mode of production can extend beyond the development of open source software, to an extent and a degree that are not yet understood: 630 One important direction in which the open source experiment points is toward moving beyond the discussion of transaction as a key determinant of institutional design. . . . The elegant analytics of transaction cost economics do very interesting work in explaining how divisions of labor evolve through outsourcing of particular functions (the decision to buy rather than make something). But the open source process adds another element. The notion of open-sourcing as a strategic organizational decision can be seen as an efficiency choice around distributed innovation, just as outsourcing was an efficiency choice around transactions costs. . . . As information about what users want and need to do becomes more fine-grained, more individually differentiated, and harder to communicate, the incentives grow to shift the locus of innovation closer to them by empowering them with freely modifiable tools. (ibid., pp. 265--267) 631 National Competitive Advantage 632 Understanding national innovation systems and the competitive advantage of a nation's firms is an important matter for national policy makers (Nelson 1993). Can what we have learned in this book shed any light on their concerns? Porter (1991), assessing national competitive advantage through the intellectual lens of competitive strategy, concludes that one of four major factors determining the competitive advantage of nations is demand conditions. "A nation's firms," he argues, "gain competitive advantage if domestic buyers are, or are among, the world's most sophisticated and demanding buyers for the product or service. Such buyers provide a window into the most advanced buyer needs. . . . Buyers are demanding where home product needs are especially stringent or challenging because of local circumstances." For example: "The continental United States has been intensely drilled, and wells are being drilled in increasingly difficult and marginal fields. The pressure has been unusually great for American oil field equipment suppliers to perfect techniques that minimize the cost of difficult drilling and ensure full recovery from each field. This has pushed them to advance the state of the art and sustain strong international positions." (ibid., pp. 89--90) 633 Porter also argues that early domestic demand is also important: "Provided it anticipates buyer needs in other nations, early local demand for a product or service in a nation helps local firms to move sooner than foreign rivals to become established in an industry. They get the jump in building large-scale facilities and accumulating experience. . . . Only if home demand is anticipatory of international need will home demand contribute to advantage." (ibid., p. 95) 634 From my perspective, Porter is making the case for the value of a nation's domestic lead users to national competitive advantage. However, he is also assuming that it is manufacturers that innovate in response to advanced or stringent user demand. On the basis of the findings reported on in this book, I would modify this assumption by noting that, often, domestic manufacturers' links to innovating lead users have the impacts on national competitive advantage that he describes---but that the lead users' input to favored domestic firms would include innovations as well as needs. 635 Domestic lead users make a difference to national competitive advantage, Porter argues, because "local firms often enjoy some natural advantages in serving their home market compared to foreign firms, a result of proximity as well as language, regulation, and cultural affinities (even, frequently, if foreign firms are staffed with local nationals)." Porter continues: "Preferred access to a large domestic customer base can be a spur to investment by local firms. Home demand may be perceived as more certain and easier to forecast, while foreign demand is seen as uncertain even if firms think they have the ability to fill it." (ibid., p. 93) 636 What new insights and research questions can the work of this book contribute to this analysis of national competitive advantage? On the one hand, I certainly see the pattern Porter describes in some studies of lead user innovation. For example, early in the history of the US semiconductor industry, AT&T, the inventor of the transistor and an early innovator, developed a number of novel types of production equipment as a user organization. AT&T engineers went to local machine shops to have these machines produced in volume to meet AT&T's in-house production needs. A side effect of this procurement strategy was to put many of these previously undistinguished firms into the business of producing advanced semi-conductor equipment to the world (von Hippel 1977, 1988). 637 On the other hand, the findings of this book suggest that the "natural advantages" Porter proposes that domestic manufacturers will have with respect to filling the needs of local lead users may be eroding in the Internet age. As has been seen in the case of open source software, and by extension in the cases of other information-based products, users are capable of developing complex products in a coordinated way without geographic proximity. Participants in a particular open source project, for example, may come from a number of countries and may never meet face to face. In the case of physical products, the emergence of a pattern of user-based design followed by "foundry-style" production may also reduce the importance of propinquity between innovating lead users and manufacturers. As in the cases of integrated circuits and kitesurfing discussed earlier in this book, users can transmit CAD product-design information files from anywhere to any suitably equipped manufacturer for production. Probably only in the case of physical products where the interaction between product and production methods are not clear will geography continue to matter deeply in the age of the Internet. Nations may be able to create comparative advantages for domestic manufacturers with respect to profiting from innovation by lead users; however, they cannot assume that such advantages will continue to exist simply because of propinquity. 638 The Sociology of Technical Communities 639 Relevant elements of this field include studies in the sociology of technology in general and studies of the sociology of open source software communities in particular. Historical accounts of the evolution of a technology have often taken a linear view of their subject. In the linear view, a technology such as aerodynamics and related technological artifacts such as the airplane start at point A and then naturally evolve to end point B. In other words, it is implicitly assumed that the airplane will evolve from the artifact of wood and fabric and wire developed by the Wright brothers to the characteristics we associate with aircraft today. Nothing much to explain about that. 640 In the Social Construction of Technology (SCOT) model of technological evolution (Pinch and Bijker 1987), the direction in which an artifact (a product, for example) evolves depends very much on the meanings that different "groups with a problem" construct for it. These meanings, in turn, affect which of the many possible variations of a product are developed, how they evolve, and whether and how they eventually die. Groups that construct the meanings of a product centrally include, but are not restricted to, product users. For example, in the case of the bicycle, some relevant groups were users of various types---people who wanted to travel from place to place via bicycle, people who wanted to race bicycles, etc. Relevant non-user groups included "anticyclists," who had a negative view of the bicycle in its early days and wanted it to fail (Bijker 1995). 641 When one takes the views of all relevant groups into account, one gets a much richer view of the "socially constructed" evolution of a technology. As a relatively recent example, consider the supersonic transport plane (SST) planned in the United States during the 1970s. Airlines, and potential passengers were "groups with a problem" who presumably wanted the technology for different reasons. Other relevant groups with a problem included people who expected to be negatively affected by the sonic boom the SST would cause, people who were concerned about the pollution its engines would cause in the stratosphere, and people who had other reasons for opposing or supporting the SST. Proposed designs evolved in an attempt to satisfy the various contending interest groups. Eventually it became clear that the SST designers could not arrive at a generally acceptable compromise solution and so the project failed (Horwich 1982). 642 Pinch and Kline (1996, pp. 774--775) elaborated on the original SCOT model by pointing out that the way a product is interpreted is not restricted to the design stage of a technology, but also can continue during the product's use. They illustrated with the case of the automobile: . . . 643 although [automobile] manufacturers may have ascribed a particular meaning to the artifact they were not able to control how that artifact was used once it got into the hands of the users. Users precisely as users can embed new meanings into the technology. This happened with the adaptation of the car into rural life. As early as 1903, farm families started to define the car as more than a transportation device. In particular, they saw it as a general source of power. George Schmidt, a Kansas farmer, advised readers of the Rural New Yorker in 1903 to "block up the hind axle and run a belt over the one wheel of the automobile and around the wheel on a [corn] sheller, grinder, saw, pump, or any other machine that the engine is capable of running, and see how the farmer can save money and be in style with any city man." T. A. Pottinger, an Illinois farm man, wrote in Wallace's Farmer in 1909 that "the ideal farm car should have a detachable backseat, which could turn the vehicle into a small truck." Other Phenomena and Fields 173 644 Of course, user innovations and modifications are involved in these cases along with users' reinterpretation of product uses. Kline and Pinch report that manufacturers adopted some of the rural users' innovations, generally after a lag. For example, a car that could also serve as a small truck was eventually offered as a commercial product. 645 Research on communities of practice offers another link between studies of user innovation and sociology (Brown and Duguid 1991; Wenger 1998). The focus of this research is on the functioning of specialist communities. Researchers find that experts in a field spontaneously form interest groups that communicate to exchange their views and learnings on how to carry out and improve the practices of their profession. Members of communities of practice exchange help in informal ways that seem similar to the practices described above as characteristic of open source software projects and communities of sports innovators. 646 Research on brand communities is still another related research thread (Muniz and O'Guinn 2001). Brand communities form around commercial brands and products (e.g., Lego construction toys) and even around products discontinued by their manufacturers e.g., Apple's Newton personal digital assistant). Brand communities can be intensely meaningful to participants and can involve user innovation. In Newton groups, for example, users develop new applications and exchange information about how to repair aging equipment (Muniz and Schau 2004). In Lego communities, lead users develop new products, new building techniques, and new offline and online multiplayer building projects that later prove to be of interest to the manufacturer (Antorini 2005). 647 The Management of Product Development 648 Finally, I turn to links between user-centered innovation and teaching on the management of product development. Information on lead users as a source of new product ideas now appears in most marketing textbooks. There also should be a link to other elements of user-centered innovation processes in the literature on product-development management---but there really isn't much of one yet. Although much of the research on user innovation cited in this book is going on in schools of management and business economics, little of this information has moved into teaching related to the product-development process as of yet. 649 Clearly, it would be useful to provide managers of both user firms and manufacturing firms with a better understanding of the management of user-centered innovation. It is a curious fact that even managers of firms that have built major product lines upon user-developed innovations may hold the manufacturer-centric view that "we developed that." For example, an early study of innovation in scientific instruments documented that nearly 80 percent of the major improvements commercialized by instrument manufacturers had been developed by users (von Hippel 1976). When I later discussed this finding with managers in instrument firms, most of them were astonished. They insisted that all the innovations in the study sample had been developed within manufacturing firms. They could be convinced otherwise only when supplied with actual publications by user-scientists describing user-built prototypes of those instrument improvements---prototypes developed from 5 to 7 years before any instrument firm had sold a functionally equivalent commercial product. 650 My inquiries into why managers in this field and others held---and largely still hold---such contrary-to-fact beliefs identified several contributing factors. First, manufacturers seldom track where the major new products and product improvements they sell actually came from. Managers see no need to set up a tracking system, because the conventional wisdom is clear: "Everyone knows new products are developed by manufacturers such as ourselves based on user needs identified by market research." Further, the manufacturing firms have market-research and product-development departments in place, and innovations are somehow being produced. Thus, it is easy to conclude that the manufacturers' innovation processes must be working as expected. 651 In fact, however, important, functionally novel innovations are often brought into manufacturers by informal channels. Product-development engineers may attend conferences and learn about important user innovations, salesmen and technical service personnel discover user-modified equipment on field visits, and so on. Once the basic innovation-related information is in house, the operating principles of a user's prototype will often be adopted, but the detailed design of the device will be changed and improved for production. After a while, the user's prototype, if remembered at all, will begin to look quite primitive to the firm's engineers relative to the much better product they have designed. Finally, when sales begin, the firm's advertising will urge customers to buy "our wonderful new product." Other Phenomena and Fields 175 652 The net result is understandable: the user roots of many new commercial products, never widely known in manufacturing firms, are forgotten. And when it is time to develop the next innovation, management again turns to the conventional methods that "worked so well for us last time." Eventually, information about new user innovations will again arrive by pathways unnoticed and unmanaged---and with an unnecessary lag. 653 To improve matters, managers must learn when it is appropriate to follow user-centered and manufacturer-centered innovation process paradigms and how user-centered innovation can best be managed when it is the method of choice. Managers in user firms and in manufacturing firms need tools with which to understand the innovate-or-buy decisions they face---to understand which product needs or which service needs users (rather than manufacturers) should invest in developing. Managers in user firms also need to learn how their firms can best carry out development work in their low-cost innovation niches: how they can best deploy their information-related advantages of being actual users and residing in the context of use to cheaply learn by doing. Managers in manufacturing firms will want to learn how they can best play a profitable role in user-centered innovation patterns when these play a role in the markets they serve. 654 Innovating users may also want to learn whether and how to diffuse their innovations by becoming manufacturers. This may be a fairly common practice in some fields. Shah (2000) found that users of sports equipment sometimes became manufacturers by a very natural process. The users would demonstrate the performance and value of their innovations as they used them in public sporting events. Some of the participants in the meets would then ask "Can you make one of those for me too?" Informal hobby-level production would then sometimes become the basis of a major company. Lettl, Herstatt, and Gemýnden (2004) report on case histories in which user-innovators became heavily involved in promoting the commercialization of important innovations in surgical equipment. These innovations tended to be developed by surgeons, who then often made major efforts to induce manufacturers to commercialize them. Hienerth (2004) documents how user-innovators in "rodeo kayaking" build their own boats, discover that kayak manufacturers (even those established by a previous generation of user-innovators) are unwilling to manufacture what they want, and so are driven to become manufacturers themselves. 655 Managers must learn that no single locus of innovation is the "right" one for either user firms or manufacturer firms. The locus of innovation varies between user firms and manufacturing firms according to market-related and information-related conditions. These conditions may well vary predictably over product life cycles. Utterback and Abernathy (1975) proposed that innovation by users is likely to be more important in the early stages of such cycles. Early in the life of a new product, there is a "fluid" stage in which the nature and the use of a product are unclear. Here, Utterback and Abernathy say, users play a big part in sorting the matter out, in part through innovation. Later, a dominant product design will emerge---a shared sense of exactly what a particular product is, what features and components it should include, and how it should function. (We all know, for example, that a car has four wheels and moves along the ground in directions determined by a steering wheel.) After that time, if the market for the product grows, innovation will shift from product to process as firms shift from the problem of what to produce to the problem of how to produce a well-understood product in ever greater volumes. From a lead user innovation perspective, of course, both functionally novel products and functionally novel processes are likely to be developed by users---in the first case users of the product, and in the second by manufacturing firms that use the process. 656 In Conclusion 657 In this book I have explored how and why users, individually and in firms and in communities, develop and freely reveal innovations. I have also argued that there is a general trend toward a open and distributed innovation process driven by steadily better and cheaper computing and communications. The net result is an ongoing shift toward the democratization of innovation. This welfare-enhancing shift is forcing major changes in user and manufacturer innovation practices, and is creating the need for change in government policies. It also, as I noted at the start of the book, presents major new opportunities for us all. Other Phenomena and Fields 177 658 Notes 659 Chapter 2 660 1. LES contains four types of measures. Three ("benefits recognized early," "high benefits expected," and "direct elicitation of the construct") contain the core components of the lead user construct. The fourth ("applications generation") is a measure of a number of innovation-related activities in which users might engage: they "suggest new applications," they "pioneer those applications," and (because they have needs or problems earlier than their peers) they may be "used as a test site" (Morrison, Midgely, and Roberts 2004). 661 Chapter 3 662 1. Cluster analysis does not specify the "right" number of clusters---it simply segments a sample into smaller and smaller clusters until the analyst calls a halt. Determining an appropriate number of clusters within a sample can be done in different ways. Of course, it always possible to say that "I only want to deal with three market segments, so I will stop my analysis when my sample has been segmented into three clusters." More commonly, analysts will examine the increase of squared error sums of each step, and generally will view the optimal number of clusters as having been reached when the plot shows a sudden "elbow" (Myers 1996). Since this technique does not incorporate information on remaining within-cluster heterogeneity, it can lead to solutions with a large amount of within-cluster variance. The "cubic clustering criterion" (CCC) partially addresses this concern by measuring the within-cluster homogeneity relative to the between-cluster heterogeneity. It suggests choosing the number of clusters where this value peaks (Milligan and Cooper 1985). However, this method appears to be rarely used: Ketchen and Shook (1996) found it used in only 5 of 45 segmentation studies they examined. 663 2. <http://groups-beta.google.com/group/comp.infosystems.www.servers.unix> 664 3. <http://modules.apache.org/> 665 4. To measure heterogeneity, Franke and I analyzed the extent to which j standards, varying from [1; i], meet the needs of the i individuals in our sample. Conceptually, we first locate a product in multi-dimensional need space (dimensions = 45 in the case of our present study) that minimizes the distances to each individual's needs. (This step is analogous to the Ward's method in cluster analysis that also minimizes within cluster variation; see Punj and Stewart 1983.) The "error" is then measured as the sum of squared Euclidean distances. We then repeated these steps to determine the error for two optimally positioned products, three products, and so on up to a number equaling I -- 1. The sum of squared errors for all cases is then a simple coefficient that measures how much the needs of i individuals can be satisfied with j standard products. The "coefficient of heterogeneity" just specified is sensitive both to the (average) distance between the needs and for the configuration of the needs: when the needs tend to form clusters the heterogeneity coefficient is lower than if they are evenly spread. To make the coefficient comparable across different populations, we calibrate it using a bootstrapping technique (Efron 1979) involving dividing the coefficient by the expected value (this value is generated by averaging the heterogeneity of many random distributions of heterogeneity of the same kind). The average random heterogeneity coefficient is then an appropriate value for calibration purposes: it assumes that there is no systematic relationship between the needs of the individuals or between the need dimensions. 666 5. Conceptually, it can be possible to generate "one perfect product" for everyone--- in which case heterogeneity of demand is zero---by simply creating all the features wanted by anyone (45 + 92 features in the case of this study), and incorporating them in the "one perfect product." Users could then select the features they want from a menu contained in the one perfect product to tailor it to their own tastes. Doing this is at least conceptually possible in the case of software, but less so in the case of a physical product for two reasons: (1) delivering all possible physical options to everyone who buys the product would be expensive for physical goods (while costing nothing extra in the case of information products); (2) some options are mutually exclusive (an automobile cannot be both red and green at the same time). 667 6. The difference between actual willingness to pay and expressed willingness to pay is much lower for private goods (our case) than for public goods. In the case of private goods, Loomis et al. (1996) found the expressed willingness to pay for art prints to be twice the actual WTP. Willis and Powe (1998) found that among visitors to a castle the expressed WTP was 60 percent lower than the actual WTP. In the case of public goods, Brown et al. (1996), in a study of willingness to pay for removal of a road from a wilderness area, found the expressed WTP to be 4--6 times the actual WTP. Lindsey and Knaap (1999), in a study of WTP for a public urban greenway, found the expressed WTP to be 2-10 times the actual WPT. Neil et al. (1994) found the expressed WTP for conserving an original painting in the desert to be 9 times the actual WTP. Seip and Strand (1992) found that less than 10 percent of those who expressed interest in paying to join an environmental organization actually joined. 668 Chapter 6 669 1. As a specific example of a project with an emergent goal, consider the beginnings of the Linux open source software project. In 1991, Linus Torvalds, a student in Finland, wanted a Unix operating system that could be run on his PC, which was equipped with a 386 processor. Minix was the only software available at that time but it was commercial, closed source, and it traded at US$150. Torvalds found this too expensive, and started development of a Posix-compatible operating system, later known as Linux. Torvalds did not immediately publicize a very broad and ambitious goal, nor did he attempt to recruit contributors. He simply expressed his private motivation in a message he posted on July 3, 1991, to the USENET newsgroup comp.os.minix (Wayner 2000): Hello netlanders, Due to a project I'm working on (in minix), I'm interested in the posix standard definition. [Posix is a standard for UNIX designers. A software using POSIX is compatible with other UNIX-based software.] Could somebody please point me to a (preferably) machine-readable format of the latest posix-rules? Ftp-sites would be nice. In response, Torvalds got several return messages with Posix rules and people expressing a general interest in the project. By the early 1992, several skilled programmers contributed to Linux and the number of users increased by the day. Today, Linux is the largest open source development project extant in terms of number of developers. 670 Chapter 7 671 1. When they do not incorporate these qualities, they would be more properly referred to as networks---but communities is the term commonly used, and I follow that practice here. 672 2. hacker n. [originally, someone who makes furniture with an axe] 1. A person who enjoys exploring the details of programmable systems and how to stretch their capabilities, as opposed to most users, who prefer to learn only the minimum necessary. 2. One who programs enthusiastically (even obsessively) or who enjoys programming rather than just theorizing about programming. 3. A person capable of appreciating hack value. 4. A person who is good at programming quickly. . . . 8. [deprecated] A malicious meddler who tries to discover sensitive information by poking around. Hence password hacker, network hacker. The correct term for this sense is cracker (Raymond 1996). 673 3. Source code is a sequence of instructions to be executed by a computer to accomplish a program's purpose. Programmers write computer software in the form of source code, and also document that source code with brief written explanations of the purpose and design of each section of their program. To convert a program into a form that can actually operate a computer, source code is translated into machine code using a software tool called a compiler. The compiling process removes program documentation and creates a binary version of the program---a sequence of computer instructions consisting only of strings of ones and zeros. Binary code is very difficult for programmers to read and interpret. Therefore, programmers or firms that wish to prevent others from understanding and modifying their code will release only binary versions of the software. In contrast, programmers or firms that wish to enable others to understand and update and modify their software will provide them with its source code. (Moerke 2000, Simon 1996). 674 4. See www.gnu.org/licenses/licenses.html#GPL 675 5. <http://www.sourceforge.net> 676 6. "The owner(s) [or `maintainers'] of an open source software project are those who have the exclusive right, recognized by the community at large, to redistribute modified versions. . . . According to standard open source licenses, all parties are equal in the evolutionary game. But in practice there is a very well-recognized distinction between `official' patches [changes to the software], approved and integrated into the evolving software by the publicly recognized maintainers, and `rogue' patches by third parties. Rogue patches are unusual and generally not trusted." (Raymond 1999, p. 89) 677 Chapter 8 678 1. See also Bresnahan and Greenstein 1996b; Bresnahan and Saloner 1997; Saloner and Steinmueller 1996. 679 Chapter 10 680 1. ABS braking is intended to keep a vehicle's wheels turning during braking. ABS works by automatically and rapidly "pumping" the brakes. The result is that the wheels continue to revolve rather than "locking up," and the operator continues to have control over steering. 681 2. In the general literature, Armstrong's (2001) review on forecast bias for new product introduction indicates that sales forecasts are generally optimistic, but that that upward bias decreases as the magnitude of the sales forecast increases. Coller and Yohn (1998) review the literature on bias in accuracy of management earnings forecasts and find that little systematic bias occurs. Tull's (1967) model calculates $15 million in revenue as a level above which forecasts actually become pessimistic on average. We think it reasonable to apply the same deflator to LU vs. non-LU project sales projections. Even if LU project personnel were for some reason more likely to be optimistic with respect to such projections than non-LU project personnel, that would not significantly affect our findings. Over 60 percent of the total dollar value of sales forecasts made for LU projects were actually made by personnel not associated with those projects (outside consulting firms or business analysts from other divisions). 682 Bibliography 683 Achilladelis, B., A. B. Robertson, and P. Jervis. 1971. Project SAPPHO. Centre for the Study of Industrial Innovation, London. 684 Aghion, P., and J. Tirole. 1994. "The Management of Innovation." Quarterly Journal of Economics 109: 1185--1209. 685 Allen, R. C. 1983. "Collective Invention." Journal of Economic Behavior and Organization 4, no. 1: 1--24. 686 Allen, T. J. 1966. "Studies of the Problem-Solving Process in Engineering Design." IEEE Transactions on Engineering Management 13, no. 2: 72--83. 687 Amabile, T. M. 1996. Creativity in Context. Westview. 688 Antelman, Kristin. 2004. "Do Open Access Articles Have a Greater Research Impact?" College and Research Libraries 65, no. 5: 372--382. 689 Antorini, Y. M. 2005. The Making of a Lead User. Working paper, Copenhagen Business School. 690 Armstrong, J. S., ed. 2001. Principles of Forecasting. Kluwer. 691 Arora, A., A. Fosfuri, and A. Gambardella. 2001. Markets for Technology. MIT Press. 692 Arora, A., and A. Gambardella. 1994. "The Changing Technology of Technological Change." Research Policy 23, no. 5: 523--532. 693 Arrow, K. 1962. "Economic Welfare and the Allocation of Resources for Inventions." In R. R. Nelson, ed., The Rate and Direction of Inventive Activity. Princeton University Press. 694 Arundel, A. 2001. "The Relative Effectiveness of Patents and Secrecy for Appropriation." Research Policy 30, no. 4: 611--624. Balachandra, R., and J. H. Friar. 1997. "Factors for Success in R&D Projects and New Product Introduction: A Contextual Framework." IEEE Transactions on Engineering Management 44, no. 3: 276--287. 695 Baldwin, C. Y., and K. B. Clark. 2003. Does Code Architecture Mitigate Free Riding in the Open Source Development Model? Working paper, Harvard Business School. 696 Barnes, B., and D. Ulin. 1984. "Liability for New Products." AWWA Journal, February: 44--47. 697 Baron, J. 1988. Thinking and Deciding. Cambridge University Press. 698 Behlendorf, B. 1999. "Open Source as a Business Strategy." In C. Dibona, S. Ockman, and M. Stone, eds., Open Sources. O'Reilly. 699 Benkler, Y. 2002. "Intellectual Property and the Organization of Information Production." International Review of Law and Economics 22, no. 1: 81--107. 700 Bessen, J. 2003. Patent Thickets. Working paper, Research on Innovation and Boston University School of Law. 701 Bessen, J. 2004. Open Source Software. Working paper, Research on Innovation. 702 Bessen, J., and R. M. Hunt. 2004. An Empirical Look at Software Patents. Working paper, Federal Reserve Bank of Philadelphia. 703 Bijker, Wiebe. 1995. Of Bicycles, Bakelites and Bulbs. MIT Press. 704 Boldrin, M., and D. Levine. 2002. "The Case against Intellectual Property." AEA Papers and Proceedings, May: 209--212. 705 Bresnahan, T. F., and S. Greenstein. 1996a. "Technical Progress and Co-Invention in Computing and in the Uses of Computers." Brookings Papers on Economic Activity. Microeconomics 1996: 1--77. 706 Bresnahan, T. F., and S. Greenstein. 1996b. "The Competitive Crash in Large-Scale Commercial Computing." In R. Landau, T. Taylor, and G. Wright, eds., The Mosaic of Economic Growth. Stanford University Press. 707 Bresnahan, T. F., and G. Saloner. 1997. "`Large Firms' Demand for Computer Products and Services: Market Models, Inertia, and Enabling Strategic Change." In D. B. Yoffie, ed., Competing in the Age of Digital Convergence. Harvard Business School Press. 708 Brooks, P. F., Jr. 1979. The Mythical Man-Month. Addison-Wesley. 709 Brown, J. S., and P. Duguid. 1991. "Organizational Learning and Communities-of-Practice: Toward a Unified View of Working, Learning, and Innovation." Organization Science 2, no. 1: 40--57. 710 Brown, T. C., P. A. Champ, R. C. Bishop, and D. W. McCollum. 1996. "Which Response Format Reveals the Truth about Donations to a Public Good." Land Economics 72, no. 2: 152--166. 711 Buenstorf, G. 2002. "Designing Clunkers: Demand-Side Innovation and the Early History of Mountain Bike." In J. S. Metcalfe and U. Cantner, eds., Change, Transformation and Development. Physica. 712 Chamberlin, E. H. 1950. "Product Heterogeneity and Public Policy." American Economic Review 40, no. 2: 85--92. 713 Christensen, C. M. 1997. The Innovator's Dilemma. Harvard Business School Press. 714 Cohen, W. M., A. Goto, A. Nagata, R. R. Nelson, and J. P. Walsh. 2002. "R&D Spillovers, Patents and the Incentives to Innovate in Japan and the United States." Research Policy 31 (8--9): 1349--1367. 715 Cohen, W. M., and D. A. Levinthal. 1990. "The Implications of Spillovers for R&D Investment and Welfare: A New Perspective." Administrative Science Quarterly 35: 128--152. 716 Cohen, W. M., R. R. Nelson, and J. P. Walsh. 2000. Protecting Their Intellectual Assets. Working paper, National Bureau of Economic Research. 717 Coller, M., and T. L. Yohn. 1998. "Management Forecasts: What Do We Know?" Financial Analysts Journal 54, no. 1: 58--62. 718 Connell, J. L., and L. B. Shafer. 1989. Structured Rapid Prototyping. Prentice-Hall. 719 Conner, K. R., and C. K. Prahalad. 1996. "A Resource-Based Theory of the Firm: Knowledge versus Opportunism." Organization Science 7, no. 5: 477--501. 720 Cook, T. D., and D. T. Campbell. 1979. Quasi-Experimentation. Houghton Mifflin. 721 Csikszentmihalyi, M. 1975. Beyond Boredom and Anxiety. Jossey-Bass. 722 Csikszentmihalyi, M. 1990. Flow. Harper and Row. 723 Csikszentmihalyi, M. 1996. Creativity. HarperCollins. 724 Dam, K. W. 1995. "Some Economic Considerations in the Intellectual Property Protection of Software." Journal of Legal Studies 24, no. 2: 321--377. 725 Danneels, Erwin. 2004. "Disruptive Technology Reconsidered: A Critique and Research Agenda." Journal of Product Innovation Management 21: 246--258. 726 Dasgupta, P., and P. A. David. 1994. "Toward a New Economics of Science." Policy Research 23: 487--521. 727 David, P. A. 1992. "Knowledge, Property, and the System Dynamics of Technological Change." Proceedings of the World Bank Annual Conference on Development Economics 1992: 215--247. 728 David, P. A. 1998. Knowledge Spillovers, Technology Transfers, and the Economic Rationale for Public Support of Exploratory Research in Science. Background paper for European Committee for Future Accelerators. 729 de Fraja, G. 1993. "Strategic Spillovers in Patent Races." International Journal of Industrial Organization 11, no. 1: 139--146. Bibliography 185 730 Dellarocas, C., N. F. Awad, and X. (M. ) Zhang. 2004. Exploring the Value of Online Reviews to Organizations. Working paper, MIT Sloan School of Management. 731 Duke, R. 1988. Local Building Codes and the Use of Cost-Saving Methods. US Federal Trade Commission, Bureau of Economics. 732 Efron, B. 1979. "Bootstrap Methods: Another Look at the Jackknife." Annals of Statistics 7: 1--26. 733 Ehrenkrantz Group. 1979. A Study of Existing Processes for the Introduction of New Products and Technology in the Building Industry. US Institute of Building Sciences. 734 Elrod, T., and A. P. Kelman. 1987. Reliability of New Product Evaluation as of 1968 and 1981. Working paper, Owen Graduate School of Management, Vanderbilt University. 735 Enos, J. L. 1962. Petroleum Progress and Profits. MIT Press. 736 Fleming, L. 2001. "Recombinant Uncertainty in Technological Search." Management Science 47, no. 1: 117--132. 737 Foray, D. 2004. Economics of Knowledge. MIT Press. 738 Franke, N., and H. Reisinger. 2003. Remaining within Cluster Variance. Working paper, Vienna Business University. 739 Franke, N., and S. Shah. 2003. "How Communities Support Innovative Activities: An Exploration of Assistance and Sharing Among End-Users." Research Policy 32, no. 1: 157--178. 740 Franke, N., and E. von Hippel. 2003a. Finding Commercially Attractive User Innovations. Working paper, MIT Sloan School of Management. 741 Franke, N., and E. von Hippel. 2003b. "Satisfying Heterogeneous User Needs via Innovation Toolkits: The Case of Apache Security Software." Research Policy 32, no. 7: 1199--1215. 742 Freeman, C. 1968. "Chemical Process Plant: Innovation and the World Market." National Institute Economic Review 45, August: 29--57. 743 Friedman, D., and D. McAdam. 1992. "Collective Identity and Activism: Networks, Choices, and the Life of a Social Movement." In A. D. Morris and C. McClurg, eds., Frontiers in Social Movement Theory. Yale University Press. 744 Gallini, N., and S. Scotchmer. 2002. "Intellectual Property: When Is It the Best Incentive System?" In A. Jaffe, J. Lerner, and S. Stern, eds., Innovation Policy and the Economy, volume 2. MIT Press. 745 Green, P. E. 1971. "A New Approach to Market Segmentation." Business Horizons 20, February: 61--73. 746 Green, P. E., and C. M. Schaffer. 1998. "Cluster-Based Market Segmentation: Some Further Comparisons of Alternative Approaches." Journal of the Market Research Society 40, no. 2: 155--163. 747 Hall, B. H., and R. Ham Ziedonis. 2001. "The Patent Paradox Revisited: An Empirical Study of Patenting in the US Semiconductor Industry, 1979--1995." RAND Journal of Economics 32, no. 1: 101--128. 748 Hall, B. H., and D. Harhoff. 2004. "Post-Grant Reviews in the US Patent System: Design Choices and Expected Impact." Berkeley Law Technology Journal, in press. 749 Harhoff, D. 1996. "Strategic Spillovers and Incentives for Research and Development." Management Science 42, no. 6: 907--925. 750 Harhoff, D., J. Henkel, and E. von Hippel. 2003. "Profiting from Voluntary Information Spillovers: How Users Benefit by Freely Revealing Their Innovations." Research Policy 32, no. 10: 1753--1769. 751 Hecker, F. 1999. "Setting Up Shop: The Business of Open Source Software." IEEE Software 16, no. 1: 45--51. 752 Heller, M. A. 1998. "The Tragedy of the Anticommons: Property in the Transition from Marx to Markets." Harvard Law Review 111: 621--688. 753 Heller, M. A., and R. S. Eisenberg. 1998. "Can Patents Deter Innovation? The Anticommons in Biomedical Research." Science Magazine 280 (5364): 698--701. 754 Henkel, J. 2003. "Software Development in Embedded Linux: Informal Collaboration of Competing Firms." In W. Uhr, W. Esswein, and E. Schoop, eds., Proceedings der 6. Internationalen Tagung Wirtschaftsinformatik 2003, volume 2. Physica. 755 Henkel, J. 2004a. The Jukebox Mode of Innovation. Discussion paper, CEPR. 756 Henkel, J. 2004b. Patterns of Free Revealing. Working paper, University of Munich. 757 Henkel, J., and S. Thies. 2003. "Customization and Innovation: User Innovation Toolkits for Simulator Software." In Proceedings of the 2003 Congress on Mass Customization and Personalization (MCPC 2003), Munich. 758 Henkel, J., and E. von Hippel. 2005. "Welfare Implications of User Innovation." Journal of Technology Transfer 30, no. 1/2: 73--87. 759 Herstatt, C., and E. von Hippel. 1992. "From Experience: Developing New Product Concepts via the Lead User Method." Journal of Product Innovation Management 9, no. 3: 213--222. 760 Hertel, G., S. Niedner, and S. Herrmann. 2003. "Motivation of Software Developers in Open Source Projects: An Internet-Based Survey of Contributors to the Linux Kernel." Research Policy 32, no. 7: 1159--1177. 761 Hienerth, C. 2004. "The Commercialization of User Innovations: Sixteen Cases in an Extreme Sporting Industry." In Proceedings of the 26th R&D Management Conference, Sesimbra, Portugal. 762 Hirschleifer, J. 1971. "The Private and Social Value of Information and the Reward to Inventive Activity." American Economic Review 61, no. 4: 561--574. 763 Hollander, S. 1965. The Sources of Increased Efficiency. MIT Press. 764 Horwich, M. 1982. Clipped Wings. MIT Press. 765 Hunt, R. M., and J. Bessen. 2004. "The Software Patent Experiment." Business Review, Federal Reserve Bank of Philadelphia Q3: 22--32. 766 Jensen, M. C., and W. H. Meckling. 1976. "Theory of the Firm: Managerial Behavior, Agency Costs, and Ownership Structure." Journal of Financial Economics 3, no. 4: 305--360. 767 Jeppesen, L. B. 2004. Profiting from Innovative User Communities. Working paper, Department of Industrial Economics and Strategy, Copenhagen Business School. 768 Jeppesen, L. B. 2005. "User Toolkits for Innovation: Users Support Each Other." Journal of Product Innovation Management, forthcoming. 769 Jeppesen, L. B., and M. J. Molin. 2003. "Consumers as Co-developers: Learning and Innovation Outside the Firm." Technology Analysis and Strategic Management 15, no. 3: 363--84. 770 Jokisch, M. 2001. Open Source Software-Entwicklung: Eine Analyse des Geschäftsmodells der STATA Corp. Master's thesis, University of Munich. 771 Ketchen, D. J., Jr., and C. L. Shook. 1996. "The Application of Cluster Analysis in Strategic Management Research: An Analysis and Critique." Strategic Management Journal 17, no. 6: 441--459. 772 Knight, K. E. 1963. A Study of Technological Innovation: The Evolution of Digital Computers. PhD dissertation, Carnegie Institute of Technology. 773 Kollock, P. 1999. "The Economies of Online Cooperation: Gifts and Public Goods in Cyberspace." In M. A. Smith and P. Kollock, eds., Communities in Cyberspace. Routledge. 774 Kotabe, M. 1995. "The Return of 7-Eleven . . . from Japan: The Vanguard Program." Columbia Journal of World Business 30, no. 4: 70--81. 775 Kristensen, P. S. 1992. "Flying Prototypes: Production Departments' Direct Interaction with External Customers." International Journal of Operations and Production Management 12, no. 2: 195--211. 776 Lakhani, K. 2005. Distributed Coordination Practices in Free and Open Source Communities. PhD thesis, Massachusetts Institute of Technology. 777 Lakhani, K. R., and E. von Hippel. 2003. "How Open Source Software Works: `Free' User-to-User Assistance." Research Policy 32, no. 6: 923--943. 778 Lakhani, K. R., and B. Wolf. 2005. "Why Hackers Do What They Do: Understanding Motivation and Effort in Free/Open Source Software Projects." In J. Feller, B. Fitzgerald, S. Hissam, and K. R. Lakhani, eds., Perspectives on Free and Open Source Software. MIT Press. 779 Lerner, J., and J. Tirole. 2002. "Some Simple Economics of Open Source." Journal of Industrial Economics 50, no. 2: 197--234. 780 Lessig, L. 2001. The Future of Ideas. Random House. 781 Lettl, C., C. Herstatt and H. Gemýnden. 2004. The Entrepreneurial Role of Innovative Users. Working paper, Technical University, Berlin. 782 Levin, R. C., A. Klevorick, R. R. Nelson, and S. G. Winter. 1987. "Appropriating the Returns from Industrial Research and Development." Brookings Papers on Economic Activity 3: 783--820. 783 Levy, S. 1984. Hackers. Doubleday. 784 Lilien, G. L., P. D. Morrison, K. Searls, M. Sonnack, and E. von Hippel. 2002. "Performance Assessment of the Lead User Idea-Generation Process for New Product Development." Management Science 48, no. 8: 1042--1059. 785 Lim, K. 2000. The Many Faces of Absorptive Capacity. Working paper, MIT Sloan School of Management. 786 Lindsey, G., and G. Knaap. 1999. "Willingness to Pay for Urban Greenway Projects." Journal of the American Planning Association 65, no. 3: 297--313. 787 Loomis, J., T. Brown, B. Lucero, and G. Peterson. 1996. "Improving Validity Experiments of Contingent Valuation Methods: Results of Efforts to Reduce the Disparity of Hypothetical and Actual Willingness to Pay." Land Economics 72, no. 4: 450--461. 788 Lýthje, C. 2003. "Customers as Co-Inventors: An Empirical Analysis of the Antecedents of Customer-Driven Innovations in the Field of Medical Equipment." In Proceedings of the 32th EMAC Conference, Glasgow. 789 Lýthje, C. 2004. "Characteristics of Innovating Users in a Consumer Goods Field: An Empirical Study of Sport-Related Product Consumers." Technovation 24, no. 9: 683--695. 790 Lýthje, C., C. Herstatt, and E. von Hippel. 2002. The Dominant Role of Local Information in User Innovation: The Case of Mountain Biking. Working Paper, MIT Sloan School of Management. 791 Machlup, F. 1962. Knowledge Production and Distribution in the United States. Princeton University Press. 792 Mansfield, E. 1968. Industrial Research and Technological Innovation. Norton. 793 Mansfield, E. 1985. "How Rapidly Does New Industrial Technology Leak Out?" Journal of Industrial Economics 34: 217--223. 794 Mansfield, E., J. Rapoport, A. Romeo, S. Wagner and G. Beardsley. 1977. "Social and Private Rates of Return from Industrial Innovations." Quarterly Journal of Economics 91, no. 2: 221--240. 795 Mansfield, E., A. Romeo, M. Schwartz, D. Teece, S. Wagner and P. Brach. 1982. Technology Transfer, Productivity, and Economic Policy. Norton. 796 Mansfield, E., and S. Wagner. 1975. "Organizational and Strategic Factors Associated With Probabilities of Success in Industrial R&D." Journal of Business 48, no. 2: 179--198. 797 Marples, D. L. 1961. "The Decisions of Engineering Design." IRE Transactions on Engineering Management, June: 55--71. 798 Martin, J. 1991. Rapid Application Development. Macmillan. 799 Matthews, J. 1985. Public Access to Online Catalogs, second edition. Neal-Schuman. 800 Maurer, S. 2005. "Inside the Anticommons: Academic Scientists' Struggle to Commercialize Human Mutations Data, 1999--2001." Research Policy, forthcoming. 801 Mead, C., and L. Conway. 1980. Introduction to VLSI Systems. Addison-Wesley. 802 Means, R. S. 1989. Building Construction Cost Data 1989. R. S. Means. 803 Merges, R., and R. R. Nelson. 1990. "On the Complex Economics of Patent Scope." Columbia Law Review 90: 839--916. 804 Merton, R. K. 1973. The Sociology of Science. University of Chicago Press. 805 Meyer, M. H., and L. Lopez. 1995. "Technology Strategy in a Software Products Company." Journal of Product Innovation Management 12, no. 4: 194--306. 806 Milligan, G. W., and M. C. Cooper. 1985. "An Examination of Procedures for Determining the Number of Clusters in a Data Set." Psychometrica 45: 159--179. 807 Mishina, K. 1989. Essays on Technological Evolution. PhD thesis, Harvard University. 808 Mitchell, R. C., and R. T. Carson. 1989. Using Surveys to Value Public Goods. Resources for the Future. 809 Moerke, K. A. 2000. "Free Speech to a Machine." Minnesota Law Review 84, no. 4: 1007--1008. 810 Mollick, E. 2004. Innovations from the Underground: Towards a Theory of Parasitic Innovation. Master's thesis, Massachusetts Institute of Technology. 811 Mountain Bike. 1996. Mountain Biking Skills. Rodale. 812 Morrison, P. D., J. H. Roberts, and D. F. Midgley. 2004. "The Nature of Lead Users and Measurement of Leading Edge Status." Research Policy 33, no. 2: 351--362. 813 Morrison, P. D., J. H. Roberts, and E. von Hippel. 2000. "Determinants of User Innovation and Innovation Sharing in a Local Market." Management Science 46, no. 12: 1513--1527. 814 Muñiz, A. M., Jr., and T. C. O'Guinn. 2001. "Brand Community." Journal of Consumer Research 27: 412--432. 815 Muñiz, A. M., Jr., and H. J. Schau. 2004. When the Consumer Becomes the Marketer. Working paper, DePaul University. 816 Myers, J. H. 1996. Segmentation and Positioning for Strategic Marketing Decisions. American Marketing Association. 817 National Sporting Goods Association. 2002. Sporting Goods Market in 2001. 818 Neil, H., R. Cummings, P. Ganderton, G. Harrison, and G. McGuckin. 1994. "Hypothetical Surveys and Real Economic Commitments." Land Economics 70: 145--154. 819 Nelson, R. R. 1982. "The Role of Knowledge in R&D Efficiency." Quarterly Journal of Economics 97, no. 3: 453--470. 820 Nelson, R. R. 1990. What Is Public and What Is Private About Technology? Working paper, Consortium on Competitiveness and Cooperation, University of California, Berkeley. 821 Nelson, R. R. 1993. National Innovation Systems: A Comparative Analysis. Oxford University Press. 822 Nuvolari, A. 2004. "Collective Invention during the British Industrial Revolution: The Case of the Cornish Pumping Engine." Cambridge Journal of Economics 28, no. 3: 347--363. 823 Ogawa, S. 1998. "Does Sticky Information Affect the Locus of Innovation? Evidence from the Japanese Convenience-Store Industry." Research Policy 26, no. 7--8: 777--790. 824 Oliver, P. E. 1980. "Rewards and Punishment as Selective Incentives for Collective Action: Theoretical Investigations." American Journal of Sociology 85: 1356--1375. 825 Oliver, P. E., and G. Marwell. 1988. "The Paradox of Group Size in Collective Action: A Theory of the Critical Mass II." American Sociological Review 53, no. 1: 1--18. 826 Olson, E. L., and G. Bakke. 2001. "Implementing the Lead User Method in a High Technology Firm: A Longitudinal Study of Intentions versus Actions." Journal of Product Innovation Management 18, no. 2: 388--395. 827 Olson, M. 1967. The Logic of Collective Action. Harvard University Press. 828 O'Mahony, S. 2003. "Guarding the Commons: How Open Source Contributors Protect Their Work." Research Policy 32, no. 7: 1179--1198. 829 Ostrom, E. 1998. "A Behavioral Approach to the Rational Choice Theory of Collective Action." American Political Science Review 92, no. 1: 1--22. 830 Pavitt, K. 1984. "Sectoral Patterns of Technical Change: Towards a Taxonomy and a Theory." Research Policy 13 (6): 343--373. 831 Penning, C. 1998. Bike History. Delius & Klasing. 832 Perens, B. 1999. "The Open Source Definition." In C. DiBona, S. Ockman, and M. Stone, eds., Opensources. O'Reilly. 833 Pinch, T., and R. Kline. 1996. "Users as Agents of Technological Change. The Social Construction of the Automobile in Rural America." Technology and Culture 37: 763--795. 834 Pinch, T. J., and W. E. Bijker. 1987. "The Social Construction of Facts and Artifacts." In W. Bijker, T. Hughes, and T. Pinch, eds., The Social Construction of Technological Systems. The MIT Press. 835 Pine, J. B. II. 1993. Mass Customization. Harvard Business School Press. 836 Polanyi, M. 1958. Personal Knowledge. University of Chicago Press. 837 Poolton, J., and I. Barclay. 1998. "New Product Development: From Past Research to Future Applications." Industrial Marketing Management 27: 197--212. 838 Porter, M. E. 1991. Competitive Advantage of Nations. Free Press. 839 Prýgl, R., and N. Franke. 2005. Factors Impacting the Success of Toolkits for User Innovation and Design. Working paper, Vienna University of Economics. 840 Punj, G., and D. W. Stewart. 1983. "Cluster Analysis in Marketing Research: Review and Suggestions for Application." Journal of Marketing Research 20, May: 134--148. 841 Raymond, E., ed. 1996. The New Hacker's Dictionary, third edition. MIT Press. 842 Raymond, E. 1999. The Cathedral and the Bazaar. O'Reilly. 843 Redmond, W. H. 1995. "An Ecological Perspective on New Product Failure: The Effects of Competitive Overcrowding." Journal of Product Innovation Management 12: 200--213. 844 Riggs, W., and E. von Hippel. 1994. "Incentives to Innovate and the Sources of Innovation: The Case of Scientific Instruments." Research Policy 23, no. 4: 459--469. 845 Rogers, E. M. 1994. Diffusion of Innovation, fourth edition. Free Press. 846 Rosenberg, N. 1976. Perspectives on Technology. Cambridge University Press. 847 Rosenberg, N. 1982. Inside the Black Box. Cambridge University Press. 848 Rothwell, R., C. Freeman, A. Horsley, V. T. P. Jervis, A. B. Roberts, and J. Townsend. 1974. "SAPPHO Updated: Project SAPPHO Phase II." Research Policy 3, no. 3: 258--291. 849 Saloner, G., and W. E. Steinmueller. 1996. Demand for Computer Products and Services in Large European Organizations. Research paper, Stanford Graduate School of Business. 850 Sattler, H. 2003. "Appropriability of Product Innovations: An Empirical Analysis for Germany." International Journal of Technology Management 26, no. 5--6: S. 502--516. 851 Schmookler, J. 1966. Invention and Economic Growth. Harvard University Press. 852 Schrage, M. 2000. Serious Play. Harvard Business School Press. 853 Schreier, M., and N. Franke. 2004. Value Creation by Self-Design. Working paper, Vienna University of Economics. 854 Seip, K., and J. Strand. 1992. "Willingness to Pay for Environmental Goods in Norway: A Contingent Valuation Study with Real Payment." Environmental and Resource Economics 2: 91--106. 855 Shah, S. 2000. Sources and Patterns of Innovation in a Consumer Products Field. Working paper, MIT Sloan School of Management. 856 Shah, S., and M. Tripsas. 2004. When Do User-Innovators Start Firms? Working paper, University of Illinois. 857 Shapiro, C. 2001. "Navigating the Patent Thicket: Cross Licenses, Patent Pools, and Standard Setting." In A. Jaffe, J. Lerner, and S. Stern, eds., Innovation Policy and the Economy, volume 1. MIT Press. 858 Simon, E. 1996. "Innovation and Intellectual Property Protection: The Software Industry Perspective." Columbia Journal of World Business 31, no. 1: 30--37. 859 Slater, Stanley F., and Narver, John C. 1998. "Customer-Led and Market-Oriented: Let's Not Confuse the Two." Strategic Management Journal 19, no. 1:1001--1006. 860 Slaughter, S. 1993. "Innovation and Learning during Implementation: A Comparison of User and Manufacturer Innovations." Research Policy 22, no. 1: 81--95. 861 Smith, A. 1776. An Inquiry into the Nature and Causes of the Wealth of Nations. Modern Library edition. Random House, 1937. 862 Spence, M. 1976. "Product Differentiation and Welfare." American Economic Review 66, no. 2, Papers and Proceedings: 407--414. 863 Taylor, C. T., and Z. A. Silberston. 1973. The Economic Impact of the Patent System. Cambridge University Press. 864 Taylor, M., and S. Singleton. 1993. "The Communal Resource: Transaction Costs and the Solution of Collective Action Problems." Politics and Society 21, no. 2: 195--215. 865 Tedd, L. A. 1994. "OPACs through the Ages." Library Review 43, no. 4: 27--37. 866 Teece, D. J. 1977. "Technology Transfer by Multinational Firms: The Resource Cost of Transferring Technological Know-How." Economic Journal 87: 242--261. 867 Thomke, S. H. 1998. "Managing Experimentation in the Design of New Products." Management Science 44, no. 6: 743--762. 868 Thomke, S. H. 2003. Experimentation Matters. Harvard Business School Press. 869 Thomke, S. H., and E. von Hippel. 2002. "Customers as Innovators: A New Way to Create Value." Harvard Business Review 80, no. 4: 74--81. 870 Thomke, S. H., E. von Hippel, and R. Franke. 1998. "Modes of Experimentation: An Innovation Process---and Competitive---Variable." Research Policy 27, no. 3: 315--332. 871 Tirole, J. 1988. The Theory of Industrial Organization. MIT Press. 872 Tull, D. 1967. "The Relationship of Actual and Predicted Sales and Profits in New Product Introductions." Journal of Business 40: 233--250. 873 Tyre, M., and E. von Hippel. 1997. "Locating Adaptive Learning: The Situated Nature of Adaptive Learning in Organizations." Organization Science 8, no. 1: 71--83. 874 Urban, G. L., and E. von Hippel. 1988. "Lead User Analyses for the Development of New Industrial Products." Management Science 34, no. 5: 569--82. 875 Utterback, J. M., and W. J. Abernathy. 1975. "A Dynamic Model of Process and Product Innovation." Omega 3, no. 6: 639--656. 876 van der Plas, R., and C. Kelly. 1998. The Original Mountain Bike Book. MBI. 877 Varian, H. R. 2002. "New Chips Can Keep a Tight Rein on Consumers." New York Times, July 4. 878 von Hippel, E. 1976. "The Dominant Role of Users in the Scientific Instrument Innovation Process." Research Policy 5, no. 3: 212--39. 879 von Hippel, E. 1977. "Transferring Process Equipment Innovations from User-Innovators to Equipment Manufacturing Firms." R&D Management 8, no. 1:13--22. 880 von Hippel, E. 1986. "Lead Users: A Source of Novel Product Concepts." Management Science 32, no. 7: 791--805. 881 von Hippel, E. 1988. The Sources of Innovation. Oxford University Press. 882 von Hippel, E. 1994. "Sticky Information and the Locus of Problem Solving: Implications for Innovation." Management Science 40, no. 4: 429--439. 883 von Hippel, E. 1998. "Economics of Product Development by Users: The Impact of Sticky Local Information." Management Science 44, no. 5: 629--644. 884 von Hippel, E. 2001. "Perspective: User Toolkits for Innovation." Journal of Product Innovation Management 18: 247--257. 885 von Hippel, E., and S. N. Finkelstein. 1979. "Analysis of Innovation in Automated Clinical Chemistry Analyzers." Science and Public Policy 6, no. 1: 24--37. 886 von Hippel, E., N. Franke, and R. Prýgl. 2005. Screening vs. Pyramiding. Working paper, MIT Sloan School of Management. 887 von Hippel, E., and R. Katz. 2002. "Shifting Innovation to Users via Toolkits." Management Science 48, no. 7: 821--833. 888 von Hippel, E., S. H. Thomke, and M. Sonnack. 1999. "Creating Breakthroughs at 3M." Harvard Business Review 77, no. 5: 47--57. 889 von Hippel, E., and M. Tyre. 1995. "How `Learning by Doing' is Done: Problem Identification in Novel Process Equipment." Research Policy 24, no. 1: 1--12. 890 von Hippel, E., and G. von Krogh. 2003. "Open Source Software and the "Private-Collective" Innovation Model: Issues for Organization Science." Organization Science 14, no. 2: 209--223. 891 von Krogh, G., and S. Spaeth. 2002. Joining, Specialization, and Innovation in Open Source Software Development. Working paper, University of St. Gallen. 892 von Krogh, G., S. Haefliger and S. Spaeth. 2004. The Practice of Knowledge Reuse in Open Source Software. Working paper, University of St. Gallen. 893 Wellman, B., J. Boase, and W. Chen. 2002. The Networked Nature of Community On and Off the Internet. Working paper, Centre for Urban and Community Studies, University of Toronto. 894 Wenger, E. 1998. Communities of Practice. Cambridge University Press. 895 Wayner, P. 2000. Free for All. Harper Business. 896 Weber, S. 2004. The Success of Open Source. Harvard University Press. 897 Willis, K. G., and N. A. Powe. 1998. "Contingent Valuation and Real Economic Commitments: A Private Good Experiment." Journal of Environmental Planning and Management 41, no. 5: 611--619. 898 Wind, Y. 1978. "Issues and Advances in Segmentation Research." Journal of Marketing Research 15, August: 317--337. 899 Winter, S. G., and G. Szulanski. 2001. "Replication as Strategy." Organization Science 12, no. 6: 730--743. 900 Young, G., K. G. Smith, and C. M. Grimm. 1996. "Austrian and Industrial Organization Perspectives on Firm Level Competitive Activity and Performance." Organization Science 7, no. 3: 243--254. 901 Endnotes 902 Endnotes 903 Index 904 Index