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Creditability modeling on real-time interaction specification for embedded systems on the distributed platform is a continuing challenge to developers. This paper presents a creditability modeling strategy that reduces complexity by separating data-related computational parts and time synchronization interaction among components. We introduce a notion of supervisor to discuss how to aggregate individual component's computation into a well-defined composite computation from a view of causality interaction analysis. A prototyping system is implemented to prove the feasibility and flexibility of our methodology.