An actor represents an element that is external
to the system.
A classifier role based on an actor represents
a coherent set of operations and messages of an external element when
it interacts with system elements during a scenario. You can choose
an existing actor, create a new one, or set the classifier role to <Unspecified>,
meaning that the actor is not a realization of an existing actor.
This could be useful in diagrams created at the high-level analysis
stage of system design. Actors are a stereotype of a class and are
defined through a Features window that is, usually, the same as that
for classes.
About this task
To create an actor, see
Creating actors.
By default, a
new actor is an <Unspecified>Realization value.
To make it an instance of a <New > or existing
package, use the drop-down list in the Features window.