Conceptual Modeling for New Information Systems Technologies : ER 2001 Workshops, HUMACS, DASWIS, ECOMO, and DAMA, Yokohama Japan, November 27-30, 2001. Revised Papers - Hiroshi Arisawa, Yahiko Kambayashi, Vijay Kumar, Heinrich C. Mayr, Ingrid Hunt ((Lecture Notes in Computer Science))