A supporting actor (also known as a secondary actor) in a use case in an external actor that provides a service to the system under design.Supporting Actors: a user who provides a service (e.g., information) to the system. The primary actor is often, but not always, the actor who triggers the use case. It has a goal with respect to the system – one that can be satisfied by its operation. The primary actor of a use case is the stakeholder that calls on the system to deliver one of its services.Primary Actor: a user whose defined user goal and is fulfilled by the system In Alistair Cockburn’s book “Writing Effective Use Cases” Actors are further defined as follows: a timer that triggers sending of an e-mail reminder. While a single physical instance may play the role of several different actors, an actor does not necessarily represent specific physical entities, i.e. Actors are always outside the system and interact directly with it by initiating a use case, provide input to it, and/or receive outputs from it. It may represent roles played by human users, external hardware, or other subjects. Actors can be people, other systems, time triggers, or event triggers.Īn actor specifies a role played by a user or any other system that interacts with the subject.
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