In this report, we propose a formal approach for the design of object-oriented component-based systems using behavioral contracts. This formalism merges interface automata describingcommunication protocols of components with the semantics of their operations. On grounds ofconsistency with the object-oriented paradigms, we revisit the notions of incremental design andindependent implementability of interface automata by novel definitions of components compatibility,composition, and refinement. Our work is illustrated by a design case study of CBTC railway systems.
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