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Elements of the use case diagram

The picture below shows the elements of a use case diagram.
Use case diagram

  1. Use case: This element is used to identify a goal of the system.
  2. Actor: This element could represent a role played by a person, a system, or a device that will use the system.
  3. Association: This element describes the fact that two elements interact with each other.
  4. System: This element represents the system in the context of the actors who use it and the features it must provide for them.