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In the software industry, Model Driven Engineering (MDE) techniques have proven useful not only for developing new software applications but for re-engineering legacy systems. However the stakeholders face costly maintenance operations due to frequent new standards and upgraded releases. Therefore, solutions ensuring a better adaptability and flexibility of modelling tools are needed. We propose an improved technique of virtual extension of meta-models with Facets that enables one to modify meta-models already in use without rebuilding completely the software product. This technique has been implemented and experimented for model alignment and evolution.

Abstract. Information System evolution requires a well-structured Enterprise Architecture and its rigorous management. The alignment of the elements in the architecture according to various abstraction layers may contribute to the management but appropriate tools are needed. We propose improvements to the Facet technique and we develop accompanying tools to master the difficulties of the alignment of the models used to structure an Enterprise Architecture. This technique has been experimented on many real life cases to demonstrate the effectiveness of our EA alignment method. The tools are already integrated in the Eclipse EMF Facet project.

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