![]() ![]() Play from Beginning and Resume Play are the concrete implementations of that abstraction. ![]() It needs concrete behavior to be operational. In UML terminology, Play Training Video is an abstract use hence, its name is in italics. Hence, it's deemed an extended behavior.įinally, in Figure 3 below, the Play Training Video has two associated actions: Play from Beginning and Resume Play. While showing an informative error page is a wise choice in application design, it's not essential to the Login action. In the use case below, displaying an error page extends the behavior of Login. The line symbol describes this with the text >. In the use case below, the Login action needs to use the Verify Login Credentials to execute its intended task.Īlso, use case diagrams have a symbol that describes how an action can enhance the behavior of another action. Use case diagrams have a symbol that describes a separate action required by a particular action.
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