Lesson 1.5: Create an includes relationship between use cases
Identify what is involved in your Use Case scenario by creating an Includes Relationship sub-scenario.
Model a separate Use Case for every unique scenario. There are certain sub-scenarios that reoccur in Use Cases of your system. Instead of describing each sub-scenario in each instance, you can describe it once in a separate Use Case, and have other Use Cases "include" this Use Case.
The sub-scenario of Checking a Customer's Credit is an ideal candidate to be moved into its own Use Case. Create a Use Case called Check Customer Credit. By doing this, you establish a relationship between the Check Customer Credit Use Case, and the Make Reservation Use Case.
1 From the Draw toolbar select the oval Use Case symbol. Place a Use Case symbol on the diagram above Make Reservation.
2 Name it Check Customer Credit, and press Enter.
3 From the toolbar, select the Includes line drawing tool and draw an Includes line from the Use Case Make Reservation to the Use Case Check Customer Credit. You do not need to name the line, simply press Enter to draw the line unnamed. Once drawn, you can adjust the positioning of the <<includes>> stereotype on the line.
