Extended use case expand the behavior of base use case, u have an option to extend the behavior of base use case any some point. Print receipt > Base use case Extend use case > Extend dependency Example Another kind of relationship between use case is called extend dependency, and extend dependency indicates optional relationship between use case. During the testing phase, you can use use case diagrams to identify tests for the system.
During the analysis and design phases, you can use the use cases and actors from your use case diagrams to identify the classes that the system requires. While gathering requirements, you can create use case diagrams to capture the system requirements and to present to others what the system should do. The use cases and actors in use case diagrams describe what the system does and how the actors use it, but not how the system operates internally.ģ Use case diagrams are helpful in the following situations:īefore starting a project, you can create use case diagrams to model a business so that all participants in the project share an understanding of the workers, customers, and activities of the business.
These diagrams also identify the interactions between the system and its actors. Use case diagrams describe the high-level functions and scope of a system. 2 Use case diagrams In UML, use case diagrams model the behavior of a system and help to capture the requirements of the system.
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