Include And Extend Relationship In Use Case Diagram

For the most part the popular text books on uml introduce the include relationship but give little useful guidance on the extend and the.

Include and extend relationship in use case diagram. As the name implies it extends the base use case and adds more functionality to the system. A set of behavior segments that may be inserted in a base use case. The include and extend relationships in use case models introduction uml defines three stereotypes of association between use cases include extend and generalisation. Extended use case is meaningful on its own it is independent of the extending use case extending use case typically defines optional behavior that is not necessarily.

Uml use case extend. 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. The arrow is labeled with the keyword extend. To simplify large use case by splitting it into several use cases to extract common parts of the behaviors of two or.

On the other side modelling a whole system with a class. The include relationship could be used. In the below diagram the calculate bonus use case doesn t make much sense without the deposit funds use case. As the following figure illustrates an extend relationship is displayed in the diagram editor as a dashed line with an open arrowhead pointing from the extension use case to the base use case.

Extend relationship is one where the extension use case adds itself to the base use case. Extend relationships do not have names. After the base use cases have been identified you can structure those use case with extend and include use cases for better clarity. Uml use case include.

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. The extending use case is dependent on the extended base use case. In uml notation the include relationship annotated with the include keyword and a dashed arrow pointing towards the include use case. Uml use case extend and include relationships.

Extend relationship between two use cases. The use case model represents the interactions between a restaurant the business system and its primary stakeholders business actors and business workers. Here are a few things to consider when using the extend relationship. This use case diagram example depicts a model of several business use cases.