Actor (UML)

An actor (Actor, " doer " ) is a model element in the Unified Modeling Language ( UML), a modeling language for software and other systems.

An actor called in UML an element that interacts with the system being modeled. He usually is related to a use case: it is the actor who initiates an application or receives the expected results of a use case. Actors should not be confused with concrete persons acting or systems but rather be regarded as a kind of role. Account Executive is, for example, as the name of an actor better suited than Mr. Meier from sale.

Because actors are a kind of Classifier, they can respond to one another generalization. An example of this can be seen in the figure showing the relationship between employee and customer service representative.

• Agents can be represented graphically in different ways

An actor as a rectangle with the keyword ( stereotype ) actor

An actor, represented by a special symbol

• UML language unit