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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.