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The first statement is false. It is not true

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that because of pair programming, we need twice as many

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developers. In fact that there is some evidence that even

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though in pair programming we have two developers working together,

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that the overall efficiency of the programmers is not really

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affected by use of this practice. In XP, code is

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rarely changed after being written. This is also definitely false.

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In fact in XP there is a lot of emphasis

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on change on the fact that the code can be changed,

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it can be resigned, because of the fact when we do

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that, we have a set of these cases that we can

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use to check right away that the code still works as

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expected. So again in XP, it's all about steering rather than

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just driving down one fixed direction. And therefore, the code can

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be changed. So this statement is false. It is definitely true

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that XP follows the test driven development paradigm. In XP we first

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write tests, and then we write the code, which is

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exactly what TDD is about. It is not true that

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the customer does not need to provide requirements in XP.

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The customer does provide requirements in the form of user

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stories, and the user stories are the starting point of

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the development process. Finally, XP is definitely an iterative software

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development process. In fact, we saw that XP is based

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on subsequent iterations of the same cycle, in which we

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select from a set of story cards, or user

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stories, the stories that we want to implement in the

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next iteration. Based on that we develop task cards,

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and then we use the task cards to write this

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case and then to write code. And we continue

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this cycle in an iterative way until we are done

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with all the story cards, and all the user

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stories, so definitely XP is an iterative software development process.