Ruth Demmel

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Software systems can be viewed from both external and internal perspectives. They are called user model and system model respectively in the human-computer interaction community. In this paper, we employ the yin-yang principle as an analytical tool for reviewing the relationship between the user model and the system model. In the traditional system-centered(More)
In today's software-intensive system development, negotia- tion between customer and supplier of required functional- ity is typically text-based. While text may be expressive enough to describe simple interactions between end-users and systems, it is severely limited when trying to unambi- guously describe complex interactions. Those potentially involve a(More)
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