In: P. De Bra; P. Brusilovsky; R. Conejo (Hrsg.). Adaptive hypermedia and adaptive web-based systems, Second International Conference, Proceedings of AH 2002. International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems (AH-02), May 29-31, Malaga, Spain, Pages 193-202, Lecture Notes in Computer Science (LNCS), Vol. 2347/2002, ISBN 3-540-43737-1, Springer, Berlin, Heidelberg, 2002.