This book constitutes the refereed proceedings of the 4th International Workshop on Technologies for E-Services, TES 2003, held in Berlin, Germany, in September 2003 in conjunction with VLDB 2003. The 16 revised full papers presented were carefully reviewed and selected for inclusion in the book. Among the topics addressed are current issues on various aspects of e-services, in particular Web services, service composition, service aggregation, service integration, cooperative process control, business process modeling, DAML-S, scalable Web services, shared Web services, context-aware services, and location-based services.