Els actors no representes les persones o sistemes físicament, però representen els seus rols. Això significa que quan una persona interactua amb el sistema de diverses maneres (assumint diferents rols) es representa amb diversos actors. Per exemple, una persona que dona atenció al client per telèfon i agafa ordres del client en el sistema serà representat per un actor Personal d' atenció al client i un actor Representant de vendes
Actors do not represent the physical people or systems, but their role. This means that when a person interacts with the system in different ways (assuming different roles) he will be represented by several actors. For example a person that gives customer support by the telephone and takes orders from the customer into the system would be represented by an actor Support Staff and an actor Sales Representative