This book constitutes the refereed joint proceedings of three workshops held during the 18th International Conference on Conceptual Modeling, ER '99, in Paris, France, in November 1999.The 30 revised full papers presented were carefully reviewed and selected from a total of around 70 submissions. The book is divided into sections on evolution in object databases; constraining change; conceptual modeling of change; methodologies for reverse engineering; systems migration; modeling, navigation, and interaction; directions in Web modeling; modeling Web information; and modeling Web applications.