The IEEE International Conference on Web Services (ICWS) has been a prime international forum for both researchers and industry practitioners to exchange the latest fundamental advances in the state of the art and practice of Web services, identify emerging research topics, and define the future of Web services. ICWS 2007 is sponsored by IEEE Computer Society Technical Committee on Services Computing and will be co-located with the 2007 IEEE International Conference on Services Computing (SCC 2007) . Both ICWS 2007 and SCC 2007 are the flagship conferences in 2007 IEEE Congress on Services (SERVICES 2007) to celebrate their third gathering along with other events to explore “Services” (Science and Technology), which was promoted by IEEE Computer Society in 2003!