![]() Save As specializes Save because it's actor-initiated, whereas First Save extends Save because it can only be initiated by the Save use case. It's useful to distinguish between actor initiated and use case initiated use cases. ![]() The document editor use case model highlights the distinction between includes, extends, and specializes (i.e., generalizes). Here's a script for the connected scenario of make call:Ī sequence diagram is a slightly more formal way to describe a scenario: This is really an attribute of the association, but in this diagram I am using a navigation arrow to point away from the initiator.Ĭonnected, busy, no answer, invalid numberĪ scenario may be described using a script. Sometimes it's useful to distinguish between actor/use case associations that are initiated by the actor and those initiated by the system.
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