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This Concept Map, created with IHMC CmapTools, has information related to: Use Case Diagrams, Actors can be Primary Actor, Use Case Diagrams contain Use Cases, Use Case Diagrams are elements of UML, Actors are External Users of the System, Use Case Diagrams contain Actors, Actors can be Secondary Actor(s), Primary Actor initiates Use Cases, Use Case Diagrams depict What users expect to do with the system, Secondary Actor(s) provides input for Use Cases, Packages typically organized by Primary Actor, Use Case Diagrams may be contained in Packages