All systems are treated as a black box the diagram places emphasis on events that cross the system boundary from actors to systems. Sequence diagrams are sometimes called event diagrams or event scenarios.įor a particular scenario of a use case, the diagrams show the events that external actors generate, their order, and possible inter-system events. Sequence diagrams are typically associated with use case realizations in the 4+1 architectural view model of the system under development. It depicts the processes involved and the sequence of messages exchanged between the processes needed to carry out the functionality. A sequence diagram or system sequence diagram (SSD) shows process interactions arranged in time sequence in the field of software engineering.
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