The current trend towards dynamic and highly scalableservice provisioning fosters the rise of Software as a Service(SaaS) platforms and so called Compute Clouds. Theon-demand provisioning of services gains more and moreinfluence. For offering enriched services that are capableof performing...

Today's shift from a product- to a service-oriented economy entails fundamental technical, organizational and economic challenges. The value generated by a service is mainly represented by intangible elements exposed at execution (Hill, 1977). Hence, service consumers expect a service to...