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Before doing that though, let's have a quiz to check whether you remember

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the basics of UML. Since we're going to talk about use cases, I want

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to ask you, what is the difference between a use case and a

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use case model. So here are the possible answers, and you can mark

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more than one. First one is that only use case models include actors.

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The second is that they are the same thing. The third one is

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that a use case model is a set of use cases. The fourth

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one says that a use case is a set of use case models.

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Finally, the last one says that use cases

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are a dynamic representation, whereas use case models

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are a static representation of a system. So

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mark all the answers that you think are correct.