Service specification upon multiple existing information systems

This paper presents an approach for the specification of business services upon multiple existing information systems (IS). Indeed, the challenges that a service architect has to face with the IS complexity from one side (due to the intertwinement of the organisational, informational, technological and ontological spaces), the complexity of its evolution from the other, and often multiple existing information systems, require a proper guidance and a methodological framework in order to implement new business services. We thus propose a process model with a referential of analysis (SAM) to support our approach and we discuss it in the context of the e-government services engineering.