Use Case Actors
An actor represents the role played by something or someone within the enterprise environment of the modeled system. It is related to the business activities of the enterprise, and interacts with the system in different use cases. It can be an element in the enterprise structure such as a division, a department, or a workstation.
Creating org-units
To create an actor in a use case diagram:
1. In the use case diagram objects toolbar, click the
Actor (UML) 
.
2. Then click in the diagram work area.
The Add Actor (UML) dialog box opens.
3. Enter the actor name and click the Create button.
If the name you enter corresponds to an actor that already exists in the repository, the
Create button becomes
Connect.
The actor then appears in the diagram.
You can create several elements successively without clicking in the toolbar each time by double-clicking the
button. To return to normal mode, press the Esc key or click on a different button in the toolbar, such as the arrow.
To move an actor in the diagram:
1. Click the actor to select it.
Black points delimit the selected actor, a frame appears around the object and the form of the cursor changes. This frame moves with the mouse to indicate where the object will be inserted when the button is released.
2. Hold the left mouse down to move the object.
3. Release the mouse button when the actor is positioned.
To assign a participant to an actor:
Having created an actor, you can assign it a participant such as an actor of the enterprise, a service or an application.
To assign a participant to an actor:
1. Right-click the actor concerned.
2. In the pop-up menu that appears, select Properties.
3. In the
Actor Player tab of the actor properties dialog box, you can for example connect an existing object by clicking the
Connect button
.
The query dialog box appears.
4. In the list of actors proposed, select the actors that interest you and click OK.
Names of selected actors appear in the diagram below the UML actor.
If the object you wish to assign to the actor does not yet exist in the repository, you can create it using the
New button
