25.1. The include Relationship
This is the most common and important relationship.
It is common to have some partial behavior that is common across several use cases. For example, the description of paying by credit occurs in several use cases, including Process Sale, Process Rental, Contribute to Lay-away Plan, and so forth. Rather than duplicate this text, it is desirable to separate it into its own subfunction use case, and indicate its inclusion. This is simply refactoring and linking text to avoid duplication.[1]
[1] It is helpful if the links are implemented with navigable hyperlinks as well.
For example:
UC1: Process Sale... Main Success Scenario:
...
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