Abstract. Synthesizing proper implementations for scenario-based specifications is often impossible, due to the distributed nature of implementations. To be able to detect problematic specifications, realizability criteria have been identified, such as non-local choice. In this work we develop a formal framework to study realizability of compositional MSC [GMP03]. We use it to derive a complete classification of criteria that is closely related to the criteria for MSC from [MGR05]. Comparing specifications and implementations is usually complicated, because different formalisms are used. We treat both of them in terms of a single formalism. Thereto we extend the partial order semantics of [Pra86,KL98] with a way to model deadlocks and with a more sophisticated way to address communication.
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