4 Chapter 1.  Introduction: The Dilemma of Inventions 1990 ] , that the comparative weakness of users in a specific industry may also cause weaknesses of the users’ specific suppliers. Therefore, developers should cooperate with a representative sample of users, since otherwise a resulting design may only have little general appeal [ Gardiner and Roth- well 1985 ] [ v. Hippel 1986 ] . Furthermore, any user statement of need or problem should be taken into consideration since any request and articulation may contain information about what form a responsive solution should take [ v. Hippel 1978 ] . What does this all mean for ubiquitous and wearable computing? The next section reflects on the obstacles and problems wearable and ubiquitous computing tech- nology is currently facing when working towards longer-lasting systems or at least systems that overcome the lab-stage and are really used in practice. 1.3   Today’s Development Practices in Ubiquitous and Wearable Computing So far, application development in ubiquitous and wearable computing communities has been mainly technology- and developer-driven with little, if at all, cooperation with users [ Korjea-aho 2000 ] [ Schilit  et al. 1994 ] [ Arnstein  et al. 2002 ] .  As the following quote states, rather the opposite should be the case: “The manufacturer-as-innovator assumption should be replaced with the view of the innovation process as predictably distributed across users, manufacturers, suppliers and others.” [ v. Hippel 1988 ] Often scenario innovation has been unsystematic and mostly based on intuition, i.e. in the beginning of ubiquitous and wearable computing, the focus was mostly to showcase and demonstrate new technology and concepts. This was articulated quite drastically at the MobileHCI conference in Udine, 2003: “Wearable Computing currently has no concepts for application de- velopments.” [ Kjeldskov and Graham 2003 ] The technology- and developer-based approach is important for generating concepts and showcases.  With regards to the applied character of ubiquitous and wear- able computing research this approach, however, only partly tackles the question of what is useful and what is perceived problematic from a user’s perspective. Ac- cordingly, only few of the developed applications are really being used in practice, e.g. [ Bardram 2004, Davies et al. 1998, Fuller et al. 2000 ] .  If applications with