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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