UML Modeling Techniques > Use case modeling > Use case diagrams > Adding items to a use case diagram
  
Adding items to a use case diagram
You can add existing items to a Use Case diagram through drag-and-drop operations, toolbar buttons and populate commands.
For information about adding Variability items to a Use Case Diagram, see the following topics:
• Adding an existing alternative choice to a diagram
• Adding an existing variant to a diagram
• Adding an existing variation point to a diagram
To add an actor to a use case diagram:
• Drag the Actor from a Modeler pane to the Use Case Diagram.
or
1. On the Use Case Diagram toolbar, click the Actor toolbar button, and then right-click on the diagram in free space.
2. From the Select Object dialog, select the Actor you want to add to the diagram, and then click OK.
To add a use case to a use case diagram:
• Drag the Use Case from a Modeler pane to the Use Case Diagram.
or
1. On the Use Case Diagram toolbar, click the . Use Case toolbar button, and then right-click on the diagram in free space.
2. From the Select Object dialog, select the Use Case you want to add to the diagram, and then click OK.
To add generalizations to a use case diagram:
1. On the diagram locate the Actor or Use Case that is connected to the Generalization you want to add.
2. Right-click the Actor or Use Case, point to Populate, and then click Parent Actors, Child Actors, Parent Use Cases or Child Use Cases as appropriate.
To add interactions to a use case diagram:
1. Locate the Actor that is connected to the Interaction you want to add.
2. Right-click the Actor, point to Populate, and then click Related Use Cases.
or
1. Locate the Use Case that is connected to the Interaction you want to add.
2. Right-click the Use Case, point to Populate, and then click Related Actors.
To add extend flows to a use case diagram:
• Locate the Use Case that is connected to the Extend Flow you want to add.
• Right-click the Use Case, point to Populate, and then click Related Use Cases.
To add a use case to a use case diagram:
1. Locate the Use Case that is connected to the Include Flow you want to add.
2. Right-click the Use Case, point to Populate, and then click Related Use Cases.