... opportunities for interactions between devices, services, spaces, and humans. As information technology moves away from the desktop, interactive system designers increasingly need to focus the user's experience, and often in a wide context, when developing concepts for new products and services. Putting the user's experience in the center of product and service development demands deep understanding of what users actually do, what their true needs are, and what usability problems actually occur [11]. Ideally, such information should be available at the start of the development process in order to inform the many important, early design decisions pertaining to product and service concepts. The best source of such information is users themselves, e.g., through the observation of actual use in the real world. Unfortunately, it is often difficult to obtain such user and usage information, in particular for new application areas such as ubiquitous computing [16] where the deployed product base ...

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