Being one of the most promising current technologies, Web Services are at the crossing of distributed computing and loosely coupled systems. Although vendors provide multiple platforms for service implementation, service integrators, developers and providers demand approaches for managing service-oriented applications at all stages of development. In this sense, approaches such as Model-Driven Development (MDD) and Service Component Architecture (SCA) can be used jointly for modeling and integrating services regardless of the underlying platform technology. Besides, WS-Policy provides a standard description for extra-functional properties, which remains independent of both the final implementation and the binding to the service in question. In this paper we show a case study in which the aforementioned MDD, SCA and WS-Policy are assembled in order to develop web services and their extra-functional properties from a platform independent model, which is later transformed into platform specific ones and then into code.)