An extension use case is a use case that extends the functionality of the original use case and may be invoked many times by other use cases.

Name: An extension use case is a use case that extends the functionality of the original use case and may be invoked many times by other use cases.
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An extension use case is used to add optional behavior to a base use case and is invoked only under specific conditions, not necessarily many times by other use cases.

An Extension Use Case Is a Use Case That Extends