EISMO (Enterprise Information System Multi-representation Ontology) project aims at defining a framework for the EIS cooperation. It is based on the paradigm of multi-representation of ontologies and aims at offering adequate services to different applications. Our goal at first is to prove the ability of EISMO to provide global understanding over EIS. In second, EISMO aims at achieving information systems interoperability (intra-inter), communication between systems, and reusability. For these purposes, we propose a conceptual framework to identify relevant information in order to allow the reusability and a better communication. Then we propose the architectural scope which, among other services, permits global query answering, or offers to reuse existing services when one introduce new models.