The objective of the workshops associated with the ER'99 18th International Conference on Conceptual Modeling is to give participants access to high level presentations on specialized, hot, or emerging scientific topics. Three themes have been selected in this respect: Evolution and Change in Data Management (ECDM'99) dealing with han dling the evolution of data and data structure, Reverse Engineering in Information Systems (REIS'99) aimed at exploring the issues raised by legacy systems, The World Wide Web and Conceptual Modehng (WWWCM'99) which ana lyzes the mutual contribution of WWW...