Guidelines:
Use-Case-Generalization in the Business Use-Case Model
Use-Case-Generalization |
A
use-case-generalization is a relationship from a child use case to a
parent use case, specifying how a child can specialize all behavior and
characteristics described for the parent. |
Topics
Use-case-generalizations are used to show that workflows share structure,
purpose, and behaviors. A parent use case may be specialized into one or more
child use cases that represent more specific forms of the parent. This is
generalization as applicable to use cases.
For comparison, see also Guidelines:
Use-Case-Generalization in the system use-case model, and Guidelines:
Generalization.
Once you have outlined the workflow of each business use case, you will find
structures and behavior that is common to several business use cases. To avoid
describing the same workflow several times, you can put the common behavior in a
business use case of its own.
A use-case instance executing a child use case will follow the flow of events
described for the parent use case, inserting additional behavior and modifying
behavior as defined in the flow of events of the child use case.
You should reconsider models that have more than one level of
use-case-generalizations. Layers of this kind make models hard to understand,
even if they are correct in all other aspects.
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© 1987 - 2001 Rational Software Corporation
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