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+We just saw two of the three distinguishing aspects of
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+the rational unified process. The fact that it is used
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+case driven and the fact that it is architecture centric.
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+The third and final distinguished aspect of R.U.P. is that
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+it is iterative and incremental. So let's see what that
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+means by considering the lifetime of a software project. Basically,
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+the lifetime of a rational unified process consists of a
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+series of cycles, such as the ones that are represented here.
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+Cycle one, cycle two, through cycle n. And as
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+you can see, these cycles can also be called increments.
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+And each one of the cycles involves all of
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+the main phases of software development. In addition, each cycle
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+results in a product release which can be internal
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+or external. More precisely, each cycle terminates with a product
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+release that includes a complete set of artifacts for
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+the project. That means code, manuals, use cases, non-functional
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+specification, test cases, and so on. So, I've just
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+said, that each cycle involves all of the main phases
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+of software development. Specifically, each cycle is further divided
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+in four phases. Inception, elaboration, construction and transition. In a
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+minute, we will look at each one of these
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+phases in detail and see how they relate to the
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+traditional activities of software development. Before that, I want
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+to mention the last level of these iterations, which happens
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+within these individual phases More precisely, inside each of these
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+phases, there might be multiple iterations. So what are these
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+iterations? Well, basically, each iteration corresponds to a group of
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+use cases that are selected so as to deal with
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+the most important risks first. So if you have a
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+set of use cases that you're considering, which means that
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+you have a set of features that you need to
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+implement, you will select for each iteration the most risky
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+ones that you still haven't realized, and realize them in that
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+iteration. And then continue in the following iterations with less and
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+less risky ones. So basically what happens in the end is
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+that essentially each iteration extends
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+the functionality beyond the previous iteration.