Abstract : Services Oriented Architecture are built through the compo- sition of services (e.g. Web Services) to define complex business process (e.g. Orchestrations). Well known methodologies focus on identifying ser- vices and orchestrations at design time. However the orchestration design phase is still a heavy burden, as it induces to deal with both technical and business domain concerns. This article proposes to use an evolution framework (Adore) to capitalize architects knowledge and best practices into “evolutions”. Architects can build business-driven orchestrations by composing reusable “evolutions” following a design–by–composition ap- proach. We apply this approach to build a legacy Soa called Seduite (validation platform for the French national research project Faros).