Chapter 4 Building Use Case Diagrams

Use case diagram objects

Object	Tool	Symbol	Description
Actor			Used to represent an external person, process or something interacting with a system, sub-system or class. See "Actors".
Use case			Defines a piece of coherent behavior in a system, without revealing its internal structure. See "Use Cases".
Association			Communication path between an actor and a use case that it participates in. See "Use Case Associations".
Generalization			A link between a general use case and a more specific use case that inherits from it and add features to it. See the "Generalizations" section in the "Building Structural Diagrams" chapter.
Dependency			Relationship between two modeling elements, in which a change to one element will affect the other element. See the "Dependencies" section in the "Building Structural Diagrams" chapter.

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