This paper describes a UML 2.0-based process that systems engineers can use to capture requirements and specify architecture. The process uses the UML exclusively for the representation and specification of system characteristics. The essential UML artifacts include use case diagrams, sequence diagrams, activity diagrams, statechart diagrams, and structure diagrams. The process is function-driven and is based heavily on the identification and elaboration of operational contracts, a message-based interface communication concept. The process is part of the I-Logix integrated systems and software engineering process HARMONY and has been applied successfully at various customer sites.
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