Book excerpt: This book constitutes the refereed proceedings of the Third International Conference on Service-Oriented Computing, ICSOC 2005, held in Amsterdam, The Netherlands in December 2005. The 32 revised full papers and 14 short papers presented together with 8 industrial and demo papers were carefully reviewed and selected from over 200 submissions. The papers are organized in topical sections on vision papers, service specification and modelling, service design and validation, service selection and discovery, service composition and aggregation, service monitoring, service management, semantic Web and grid services, as well as security, exception handling, and SLAs.