We investigate the relations between two automata-based models for describing and studying distributed services, called contract automata and communicating machines. In the first model, distributed services are abstracted away as automata – oblivious of their partners – that coordinate with each other through an orchestrator. The second one is concerned with the interactions occurring between distributed services, that are represented by channel-based asynchronous communications; then services are coordinated through choreography.\udWe define a notion of strong agreement on contract automata; exhibit a natural mapping from this model to communicating machines with a synchronous semantics; and give conditions to ensure that strong agreement corresponds to well-formed choreography. Then these results are extended to a more liberal
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