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Now let's go back to the distinguishing aspects of

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RUP, starting from the first one. That is, that the

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rational unified process is use-case driven. So let's see what

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that means. Generally speaking, we can see a system as

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something that performs a sequence of actions in response to

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user inputs. So the user submits some requests, or requests

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some functionality, and the system responds to those requests. Use

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cases, as we just said, capture exactly this interaction and

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answer the question, what is the system supposed to do

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for each user? So, this is a very important point.

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So they can represent what a system can do for

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each of the different types of users of the system.

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For this reason, and as we will see in more

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detail, in the rational unified process, use cases are a

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central element of the whole development life cycle. From requirements

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engineering, all the way through the process until testing and maintenance.

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So, once more, use cases are used to support and

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help each one of these phases in the rational unified process.