This book constitutes the refereed preceedings of the Third International Workshop on Technologies for E-Servies, TES 2002, held in conjunction with VLDB 2002 in Hong Kong, China in August 2002. The 14 revised full papers presented together with 4 invited papers were carefully reviewed and selected. Among the topics addressed are database issues for e-services, b2b integration, model transformation, process-based application development, information fusion, information integration, business relation management, mobil servies, trust-based web security models, etc.