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+Next I'm going to go over some of the XP's values
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+and principles that I just hinted on earlier in the lesson.
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+The first one, the first important value is communication. There
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+is no good project without good communication. And XP tries to
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+keep the right communication flowing and it uses several practices
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+to do that. It's got practices based on and require information
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+and in general share the information. For example, pair programming.
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+And we're going to say more about that. User stories, customer involvement,
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+all activities that help communication,
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+that faster communication. Another important
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+principle that we already saw, is simplicity. And the motto here
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+is live for today without worrying too much about the
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+future. When you have to do something, look for the simplest
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+thing that works. And the emphasis here is on, that
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+works. We want to build something simple, but not something stupid.
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+Feedback. That's extremely important in XP, and it occurs at
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+different levels, and it is used to drive changes. For example,
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+developers write test cases. And that's immediate feedback. If your test cases
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+fail, there's something wrong with the code. Or there's something that you
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+still haven't developed. Developers also estimate new stories right away as soon
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+as they get them from the customers and that's immediate feedback to
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+the customer. And finally, on a slightly longer time frame, customers and
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+tester develop together functional system test
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+cases to assess the overall system.
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+And also in this case, that's a great way to provide feedback
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+and by the way, also to help communication. And finally, courage, the courage
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+to throw away code if it doesn't work. To change it if you
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+find a way to improve it. To fix it if you find a problem.
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+To try out new things if you think that they might work better
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+than what you have right now. Now, that we can build and test systems
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+very quickly, we can be much braver than what we were before. So
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+how do we accomplish all that? And what are XP's practices that are going to
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+help us follow these principles and adhere to those values? These are some
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+of XP practices. There are more, but those are the ones that I'd like
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+to discuss in a little more depth, individually. Incremental planning,
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+small releases, simple design, test first, refactoring. We will actually
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+have a whole lesson next on refactoring. Pair programming, continuous
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+integration, and on-site customer. So let's start with incremental planning.