10+ usecase extends

Multiple Projects with System Boundaries. If you want to show that either one of multiple actors can be.

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If initiator X starts use case A which itself extends to a use case B the initiating event is the exception point decision.

. The extends use case heirarchy can facilitate reuse of use case descriptions by keeping details out of the more abstract representations. 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. As you can see even a system as big as a vehicle sales system contains not more than 10 use cases.

Two or more actors connected to one use case mean that all actors are involved in this use case. In the above use case diagram the use case Open book includes the use case Read book. The figure below shows a use case diagram example for a vehicle system.

If you want to draw them while learning you can use our tool to create use case diagrams. So initiator of use case B still is the initiator. Extend represents the specification that the behavior of a UseCase may be extended by the behavior of another usually supplementary UseCase.

Most of the time an extend relationship has a condition attached to it. In other words the extended use case adds itself to the base use case. The extend use case never appear on its own as a behavior sequence.

If a use case B extends a use case A does it mean that an actor who is only associated with use case A. It occurs at a specific point in the base use case behavior sequence in most cases that point is a condition. A use case called Òdispense valueÓ could further by.

UML Use Case Extend. Include and Extend Use Case Diagram. Include Use Case Example.

There can be 5 relationship types in a use case diagram. If a reader opens the book she must read it too as it is mandatory for the base use case open. The extended use case executes only when.

A set of behavior segments that may be inserted in a base use case. These extension points identify where the behavior of an extension use case can be inserted into the base use case. Use Case Diagram Example.

The User Guide for Sparx Systems Enterprise Architect. Extend relationships do not have names. The extension takes place at one or.

In UML modeling you can create extension points for the base use case. Is also associated with use case B. As the following figure illustrates an extend relationship is displayed in the.

Free 14 Sample Use Case Diagram In Pdf Ms Word

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