Based on shared care information systems' requirements for high level interoperability, a generic component architecture has been derived. For implementing, running and maintaining acceptable and useable health information systems components, all views of the ISO Reference Model - Open Distributed Processing have to be considered. Following the Model Driven Architecture (MDA) paradigm, a reference model as well as concept-representing domain models both independent of platforms must be specified, which are combined and harmonised as well as automatically transferred into the platform-specific models using appropriate tools.