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Use case diagram

What is Use Case Diagram?

  • It is list of actions or events, shows interaction between an an actor (human or external system) and a system.
  • It is used in early stages of model.
  • It is the simplest diagram.
  • It is used to show discrete unit or work.

What are the component of Use Case diagram ?

  • Actor : It is either a human or an external machine. It is also known as role.
  • It is represented by an ovule shape with title in it. Use case show the event being made by an actor.
  • Use case diagram show relationship using keyword “”.

Fore example: