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UML Use Case Diagram Elements

publish date: 2026/06/06 20:00:14.334360 UTC

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In a UML use case diagram, how are actors and interactions represented?

Actors as rectangles; interactions as arrows

Both actors and interactions as named rectangles connected by labeled arrows

Actors as stick figures; each class of interaction as a named ellipse; lines link actors to interactions

Actors as clouds; interactions as rounded rectangles

Correct Answer

Actors as stick figures; each class of interaction as a named ellipse; lines link actors to interactions

Explanation

In use case diagrams, actors (who may be human or other systems) are represented as stick figures. Each class of interaction is represented as a named ellipse. Lines link the actors with the interactions. Optionally, arrowheads may be added to show who initiates the interaction.

Reference

Software Engineering, Ian Sommerville, 9th edition

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