This paper deals with the composition of system-level specifications, and more generally a multi-formalisms codesign methodology in the context of AEROSPATIALE Aircraft avionics systems. The methodology is based on a unified system model, named SOLAR, which is used to compose three specification languages: ActivityCharts/StateCharts, SDL, and SAO. The model serves the rest of codesign tasks. Multi-formalisms composition principles are illustrated on an avionics system that is part of AIRBUS A340 on-board systems family. Results and perspectives are also outlined

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