MDA software development requires the interoperability of a wide range of modelling services (operations taking models as inputs and outputs), such as model edition, model transformation, and code generation. In particular, software development life cycle requires the interoperability of different modelling services. In particular, this interoperability concerns how to “connect” services (how to send an output model produced by one service as an input to another service). Today, the notion of modelling services is not yet well defined. Moreover, CASE tools, which implements different services, have heterogeneous interfaces. For this reason, the service connection is costly and cannot be automated. Currently, there are few works addressing this problem. Therefore, we propose an architecture and a prototype enabling the services of different tools to be connected.