Use Case Diagram Include And Extend
This article will look into various use case diagram relationships in detail and explain them using examples. Use fields specified in a cu into another cu.
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Extend is a directed relationship that specifies how and when the behavior defined in usually supplementary optional extending use case can be inserted into the behavior defined in the extended use case.
Use case diagram include and extend. In this case enroll in university is the base use case and perform security check is the extending use case. Extended use case is meaningful on its own it is independent of the extending use case. Base use case could be abstract use case incomplete or concrete.
In fact many tend to confuse extend include and generalization. The extend relationship is used to include optional behavior from an extending use case in an extended use case. Uml use case include.
The include and extend relationships in use case models introduction uml defines three stereotypes of association between use cases include extend and generalisation. For the most part the popular text books on uml introduce the include relationship but give little useful guidance on the extend and the. Uml use case specification for an extended use case.
Use case diagram is a behavioral uml diagram type and frequently used to analyze various systems. When it comes to drawing use case diagrams one area many struggles with is showing various relationships in use case diagrams. Whats is the difference between include and extend in use case diagram.
It shows an extend connector and an extension point search. Uml use case extend and include relationships mar 17 2009 3 min read from now and then i have to create uml diagrams to model certain parts of software projects especially for the university. Uml use case extend.
In the use case diagram of figure 1 you see the use case perform extends the use case enroll in university the notation for doing so is simply a normal use case dependency with the stereotype of extend. I was baffled while creating some use case diagrams and answering some questions of this website users all with a similar problem and no obvious solution using uml 24. Uml include extend relationship.
They enable you to visualize the different types of roles in a system and how those roles interact with the system. Take a look at the use case diagram example below.
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