Spécification et conception de systèmes communicants: une approche rigoureuse basée sur des scénarios d'usage D. Amyot, L. Logrippo, and R.J.A. Buhr Abstract This paper illustrates a rigorous approach, based on scenarios (Use Case Maps), which goes from informal requirements to a formal specification (in LOTOS) and provides a way to evaluate alternative architectures and to generate functional test cases. An example is given: a Group Communication Server.