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Editorial Team
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Asked: 2026-05-11T17:15:09+00:00

Alright, on a true false question: a)The actors of a system are only represented

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Alright, on a true false question:

a)The actors of a system are only represented by humans or another software components.

I said TRUE, and the teacher marked it as wrong, not because he considered that I missed hardware components (which I guess I would partially concede), but because, on his words:

“TIME is also an actor.”

How would an use case diagram consider TIME as an actor??

Please refer to any bibliography which considers time an actor. I haven’t found any, and truthfully I don’t think it makes any sense. Time doesn’t act by itself, it’s either a system or a person that works on a schedule.

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1 Answer

  1. Editorial Team

    The UML 2 Use Case Diagramming Guidelines here…

    http://www.agilemodeling.com/style/useCaseDiagram.htm

    … show how Time can be represented.

    I suspect though that you should ask your Teacher to explain how Time is an actor and how it’s represented on a Use Case diagram because, after all, they’ll be marking your next assignment and so their interpretation trumps all others 🙂

    Oh, and Wikipedia says Time is an Actor, so it must be true:

    http://en.wikipedia.org/wiki/Use_case

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