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>>Intuitive to use<< is so often assigned to tangible user interfaces (TUIs) and physical interaction, for example, in conference lectures, informal communication and in scientific publications, that it seems obvious that physicality evokes intuitive use. However, on closer inspection the topic becomes less obvious. It appears that the use of the term intuitive are diverse and a common definition is still missing; this is true in general for the field HCI but it is particularly true for the fields physicality and tangible interaction. Our aim is to review formerly separated ideas on intuitive use, physicality and TUIs that were partly included in past publications, and to investigate further aspects, which enable or facilitate intuitive use, namely image schemas and familiarity. As interac tion has an impact on the overall product experience, we also discuss whether intuitive use influences the users aesthetic judgements of such products. The paper concludes by underpinning the suitability of tangible interfaces to evoke intuitive use and by calling on taking the concept of intuitive use of user interfaces further for theoretical assessment and development of tangible interfaces

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Abstract. This paper outlines our current research program in the fields of ambient intelligence and context-aware computing and the tools we are building to accomplish this research program. From a discussion of our conception of mental models in the domain of ambient context-aware computer systems we derive hypotheses which we intend to test empirically. A modular framework for implementing and assessing situation awareness in humans and computers is introduced. We describe the framework's architecture and illustrate its suitability for its intended purpose. Finally, we present an outline of our next steps towards real world application systems for our research.