This book constitutes the thoroughly refereed postproceedings of the First International Workshop on Semantic Web Services and Web Process Composition, SWSWPC 2004, held in San Diego, CA, USA in July 2004.The 9 revised full papers presented together with an introduction by the volume editors, a panel summary and the extended abstract of an invited talk were carefully selected during two rounds of reviewing and improvement.Web services and Web processes promise to ease several current Web infrastructure challenges, such as the integration of data, applications and processes. Web services are truly platform independent and allow the development of distributed loosely coupled applications, a key characteristic for the success of dynamic processes.