Use Case Relationships

• Communication Association:
  • Between an actor and a use case
  • Uni-directional or bi-directional
  • Uni-directional association shown by an arrow head to the destination
• Relationships between use cases:
  • Include or extend
  • Stick arrow head is put nearest to the use case that is being used
  • Stick arrow head is put next to the base use case that is being extended.
  • Include and extend are stereotype associations between use cases