This volume includes the proceedings of all the ?ve workshops that were held as part of the International Conference on Service-Oriented Systems 2007 (ICSOC 2007): Mashups 2007: First International Workshop on Web APIs and Services Mashups NFPSLA-SOC 2007: Workshop on Non-Functional Properties and Service Level Agreements in Service-Oriented Computing SeMSoc 2007: Second International SeMSoC Workshop Business-Oriented Aspects Concerning Semantics and Methodologies in Service-Oriented Computing TSOA 2007: First International Workshop on Telecom Service-Oriented Architectures WESOA2007:...