The use case diagram shows the functionality of the system from an outside-in viewpoint.
|Actors (stick men) are anything outside the system that interacts with the system.|
|Use Cases (ovals) are the procedures by which the actors interact with the system.|
|Solid lines indicate which actors interact with the system as part of which procedures.|
|Dashed lines show dependencies between use cases, where one use case is 'included' in or 'extends' another.|
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