  Notion of actor
An actor is an active entity that carries out actions to achieve goals by exercising its knowhow. (p12)
Actors in realistic social contexts have many dependencies on other actors as well as dependencies from other actors.
Grouping and categorizing dependencies as belonging to sub-units of a social actor can serve as a way of modelling the "internal" structure of an actor, while still perserving the intentional actor abstraction provided by the SD model - i.e. modeling processes in term of external relationships. (p16)
We use the term actor to refer generically to any unit to which intentional dependencies can be ascribed.(p17)
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