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In a Use Case diagram a line may connect an “Actor” to a “Use Case” or one Use Case to another. If you are new to UML don’t worry yet about the types of lines connecting Use Cases. The next few steps will
show you how to add a line to a Use Case diagram.
There are three types of connections between Use Cases:
JVISION 1.4 has the ability to bind text labels to lines, so that they will follow a line when moved.
- Includes -
Create a Use Case to capture processes that seem to repeat in multiple Use Cases.For example Use Case A describes processes 1 and 2, while Use
Case B describes processes 3 and 2. Instead of repeating the description of process 2 in Use Cases A and B, create a third Use Case C that describes process 2. Then Use Case A and Use Case B each
include Use Case C.
- Extends -
Create a new Use Case to capture an exception to the rule tha “extends” another Use Case which describes the normal course of events.
- Generalization -
For example, you might create an abstract Use Case from which concrete Use Case’s inherit.
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