Use Case Diagram Include And Extend
Uml use case include. The extending use case is dependent on the extended base use case.
Uml Use Case Diagram Do Generalisation Children Inherit
The include relationship could be used.
Use case diagram include and extend. In the below diagram the calculate bonus use case doesnt make much sense without the deposit funds use case. The extending use case is usually optional and can be triggered conditionally. In the diagram you can see that the extending use case is triggered only for deposits over 10000 or when the age is over 55.
So for instance an uml use case diagram can help a lot in explaining the main functionalities of a program either to some other technical person or to the user itself or even to create the diagram with the user itself. 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. To simplify large use case by splitting it into several use cases to extract common parts of the behaviors of two or.
It shows an extend connector and an extension point search. The extend relationship is used to include optional behavior from an extending use case in an extended use case. Use case include is a directed relationship between two use cases which is used to show that behavior of the included use case the addition is inserted into the behavior of the including the base use case.
For the most part the popular text books on uml introduce the include relationship but give little useful guidance on the extend and the. Take a look at the use case diagram example below. The include and extend relationships in use case models introduction uml defines three stereotypes of association between use cases include extend and generalisation.
On the other side modelling a whole system with a class. Uml use case extend and include relationships. Extended use case is meaningful on its own it is independent of the extending use case.
Uml use case extend.
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