Dr. Adelheit Stein is a senior researcher at GMD-IPSI within the DELITE division. She received her master degree in Sociology, Philosophy and Psychology, and also her Ph.D. in Social Sciences from the University of Konstanz. At the university she worked in two international research projects, focusing on theories and empirical studies on interpersonal interaction. From 1984 to 1987 she was deputy manager of the German Association of Online Information Providers in Frankfurt am Main (AFI e.V.). Her current research activities at GMD include: dialogue modeling and planning, mixed-initiative human-computer collaboration, intelligent multimodal interfaces, image indexing and retrieval, and empirical evaluation of information systems. She has been involved in various basic and applied research projects on intelligent retrieval dialogue systems, and other external cooperations.