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).

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

Extend and include in the UML use case diagram

Inheritance and Composition in Python - GeeksforGeeks

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

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

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What is the difference between extend and include functions in a use case diagram and their uses? - Quora

Extending the UML use case metamodel with behavioral information to facilitate model analysis and interchange

What is code reuse and why is it important?