Please note : This help page is not for the latest version of Enterprise Architect. The latest help can be found here.

Use Case Toolbox

The Use Case Toolbox is used to model system functionality from the perspective of a system user; Use Case objects are used to build the Use Case models, which describe the functionality of the system to be built, the requirements, the constraints and how the user interacts with the system.

Sequence diagrams can be associated with Use Cases to capture work flow and system behavior.

Use Case Toolbox pages



See also


Except where discussed here, each element and relationship that you can create using these Toolbox pages is described in the UML Elements and UML Connectors sections of the Help.




These two relationships are stereotyped Dependency relationships defined by the Open Modeling Language (OML):

·Invokes indicates that Use Case A, at some point, causes Use Case B to happen
·Precedes indicates that Use Case C must complete before Use Case D can begin

The Basic Use Case icon adds the Basic Use Case Pattern to your diagram as a starting point for developing the diagram (drag the icon onto the diagram to open the Add Pattern <name> to Diagram dialog and click on the OK button).

Behavioral Diagram Elements

Structural Diagram Elements

UML Connectors

Test Case

(System) Boundary







Add Pattern Dialog


·To add an element to the currently-open diagram, click on the appropriate icon and drag it into position on the diagram; set an element name and other properties as prompted
·To add a relationship, click on the appropriate icon, then click on the start element in the diagram and drag to the end element

Learn more