We empirically investigate if tournaments between heterogeneous contestants are less intensive. To test our hypotheses we use professional sports data from the TOYOTA Handball-Bundesliga, the major handball league in Germany.[...]

Following tournament theory, incentives will be rather low if the contestants ofa tournament are heterogeneous. We empirically test this prediction using alarge dataset from the German Hockey League. Our results show that indeed theintensity of a game is lower if the teams are more...

This contribution is a long-term study of the evolving use of the organization-widegroupware in a service network. We are describing the practices related to organization-wide groupwarein conjunction with local groupware-related practices and how they have proceeded since theorganization was...

I received a masters degree in Computer Science at the University of Kaiserslautern, Germany, specializing in Database Systems and Artificial Intelligence. Becoming more and more interested into the interplay between social systems and software systems, I decided to work in much more...

Although the idea of electronically networked individuals forming a community is one of the oldest visions in computer science, it has never been a research issue a community of computer scientists was dedicated to. Neither had group work been before it evolved as a research issue in the...