Create A UML Use Case Diagram - Microsoft Support

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Use connector shapes to indicate relationships between shapes in the diagram. There are five connectors available:

Connector	Description
Association	Shows the relationship of an actor to a use case.
Dependency	Indicates that one use case has a dependency on another.
Generalization	Indicates that a use case is a specific way to achieve goals of the general use case.
Include	Shows how a use case is broken into smaller steps.
Extend	Shows that one use case adds functionality to another.

Example: To indicate a relationship between an actor and a use case

In a use case diagram, drag an Association connector shape onto the drawing page.
Glue one endpoint of the Association shape to a connection point on an Actor shape. Glue the other endpoint to a connection point on a Use Case shape.