Abstract
Integration of distributed information systems, autonomous and in real time, heterogeneous and auto adaptable to the context. Thos impact can resolve many problems in different system based on SOA and web services. In this paper, we are interested in defining an approach to provide the different needs of a self-adaptability of SOA to context based on workflow, define the real time goal in our approach and showing the feasibility of this approach in an ambulance trajectory case study.