The internet and modern interactive applications like games present new challenges for computer sicence: Not only the development of clever algorithms but even more the creation of a satisfying and productive user experience are key areas for computer scientists. With modern graphical equipment we have the tools for a rich interface at hand - now we only have to use them properly.
Interactive computing is a central concept that we still have to understand theoretically and practically. The state of an interactive system is influenced by numerous factors and must be represented internally and - this is the difficult part - also presented in a form comprehensible to the user.
In this talk I will present some ideas about the concept of interactivity and support this by some recent examples.
