User Modeling 2001 8th International Conference, UM 2001, Sonthofen, Germany, July 13-17, 2001. Proceedings - Bauer, Mathias; Bauer, Mathias; Gmytrasiewicz, Piotr J.; Gmytrasiewicz, Piotr J.; Vassileva, Julita; Vassileva, Julita (Springer Berlin Heidelberg : Imprint: Springer, 2001)