UML 2.0 Elements for Use Case Diagrams

Following are elements for use case diagrams as defined by UML 2.0:

• Subject: Formerly known as the system boundary element. Use the subject element to group use case elements.
• Specialize Link: A specialize link allows you to show that a use case may be specialized by another use case.
• Performance Link: The performance link allows you to model many to many relationships between an actor and a use case.
• Use Case Collaboration: A use case collaboration represents a conceptual modeling element to define ownership of subjects, use cases, and actors.

NB: By default, Together uses the UML 1.4 specification for modeling diagrams. To enable UML 2.0 support, see Enabling UML 2.0 Features.

For more information about the elements for use case diagrams that have not changed with respect to UML 2.0, see the use case diagram modeling section for UML 1.4 at the links listed below:

• Actor
  Working with Actors
  Creating Actors
  Editing Actors
• Use Case
  Working with Use Cases
  Creating Use Cases
  Editing Use Cases
  Adding an Extension Point
• Extends Link
  Using the Extends Link
• Includes Link
  Using the Includes Link