A use case may contain complex functionality consisting of several steps that are difficult to understand. To simplify the use case and make it more easily understood, we could extract the more complex steps into their own use cases. This type of use case is called an extension use case in that it extends the functionality of the original use case.

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An extension use case extends the functionality of the original use case by extracting complex steps into their own use cases.

A Use Case May Contain Complex Functionality Consisting of Several