This book constitutes the refereed proceedings of the 4th International Conference on Service-Oriented Computing, ICSOC 2006, held in Chicago, IL, USA in December 2006.

The 34 revised full papers and 16 short papers presented together with 12 industrial and demo papers were carefully reviewed and selected from over 200 submissions. The papers are organized in topical sections on service mediation, grid services and scheduling, mobile and P2P services, service composition, adaptive services, data intensive services, service management: registry, reliability, XML processing, service modeling, business services: transaction, licensing, and SLA assessment, service discovery and selection, quality of service (policy, transaction and monitoring), business service modeling, service assembly, vision papers, experience with deployed SOA, SOA architectures, early adoption of SOA technology.