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  Use Case Diagram

Introduction to Use Case diagram

Various aspects related to use  case diagrams are given  below:

Use case diagrams models the dynamic aspects  of a system.

A use case diagram depicts.

Use case : use  cases  are the  description  of a set  of sequences of actions, that  a system performs  yielding  an observable  result  of value of actor.

Actors:  actors are the set of roles that users of use case  play  when interacting  with  the use case.

  • Use case diagrams help in understanding how the elements of the system may be used in the context. This enables the user to comprehend how to use that element effectively.
  • Use case diagrams are represented as shown in fig 8.19.
  • Use case are represented by ovals. Labels with ovals represent the functions of the system.
  • Representation of a use case is shown in fig 8.20.
  • Actors are the users of a system. They represent who will access the functions the system. In fig 8.21, an actor is shown who exercise the use.
  • Relationship between an actor and a use case is illustrated with signal line. The view supports the behaviour of the system. This represents the visible services that the system provides in context of its environments. Use case diagrams are applied in the following ways:
  • Modelling the context to a system : It involves defining a system and asserting which actors lie outside the system and interact with it.
  • Modelling the requirements of a system: It involves specifying what that system should do.

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