uml - Actors in the use case digram -

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I have a question about the use case diagram, I started by identifying the actors, but I have some subsystems Came in those who confuse me whether to take them as actors or not.I know that an actor can be human, system and anything that aims in the system, but I want to point this point to the right cast To target T he wants. Thanks

The system can change the state, whatever is in the form of an actor .


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