10+ usecase extends

If a use case B extends a use case A does it mean that an actor who is only associated with use case A. Multiple Projects with System Boundaries.

If you want to show that either one of multiple actors can be.

. Most of the time an extend relationship has a condition attached to it. Indicates that an Invalid Password use case may include subject to specified in the extension the behavior specified by base use. As the following figure illustrates an extend relationship is displayed in the.

In UML modeling you can create extension points for the base use case. The extend use case never appear on its own as a behavior sequence. Include Use Case Example.

Use Case Diagram Example. Extend relationships do not have names. It occurs at a specific point in the base use case behavior sequence in most cases that point is a condition.

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. Two or more actors connected to one use case mean that all actors are involved in this use case. UML Use Case Extend.

Is also associated with use case B. The extension takes place at one or. Include and Extend Use Case Diagram.

Extend represents the specification that the behavior of a UseCase may be extended by the behavior of another usually supplementary UseCase. The extended use case executes only when. In the above use case diagram the use case Open book includes the use case Read book.

The extending use case defines the steps that may be executed by the extended use case under. A set of behavior segments that may be inserted in a base use case. So initiator of use case B still is the initiator.

In other words the extended use case adds itself to the base use case. Use Case Relationship Visual Representation. If initiator X starts use case A which itself extends to a use case B the initiating event is the exception point decision.

If a reader opens the book she must read it too as it is mandatory for the base use case open. Extension takes place at extension points defined in extended use case. These extension points identify where the behavior of an extension use case can be inserted into the base use case.

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