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Use-case Diagrams

Use-case diagrams are used to show which actors within a domain can perform what actions. The diagram contains all of the actors on the left-hand side, the system in a central box and any external actors that do not perform any user actions on the right-hand side. All actions that the actors perform are inside the central box and have a line to either crewmember or viewer to represent who can perform that specific user action.

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