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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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+6
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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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+9
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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.