Reuse in Use-Case Models: Extends, Includes, and Inheritance

Potential reuse can be model through four generalization relationships supported by UML use-case models: extends, includes, and inherits (UC and actor).

What are Include and Extend Relationships in a Use Case Diagram?

Use Case Diagram's Include and Extend Demystified - Software Ideas Modeler

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UML use case include relationship shows that behavior of the included use case is inserted into the behavior of the including use case.

uml - What's is the difference between include and extend in use case diagram? - Stack Overflow

uml - What's is the difference between include and extend in use case diagram? - Stack Overflow

Include” and “Extend” Use Cases - Visual Paradigm Blog

uml - Use Case Diagram having trouble with extends and includes in my diagram - Stack Overflow

Reuse in Use-Case Models

10.2.5. Multiple Inheritance

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