Context-aware applications are one of the most important forms of next generation interactive systems. We discuss new attributes exhibited by context-aware interactions and introduce our experience with developing a tool for prototyping location-enhanced applications, which are a useful subset of context-aware applications. Based on this, we discuss what challenges we face in developing a more general context-aware application design tool and how these challenges can be addressed. In addition, we briefly describe our ongoing work on building such a tool for prototyping general context-aware applications based on human activities
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