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+The next practice I want to discuss is a very important one
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+in XP, and also one of the scandal, controversial, and it's
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+the practice of pair programming. What does it mean? It means
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+that all production code is written with two people looking at one
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+machine. And not that they're, they're working with one keyboard and
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+one mouse or they're not just interfering and writing on each other's
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+code. And the way in which that happens is by playing
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+different roles at different times. So the two developers alternate between the
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+role of programming and strategizing, where strategizing means, for example,
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+looking at the code that has been written and thinking whether
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+that would work. Or what other tests that are not there
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+might not work, given the way the code is being written.
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+Or maybe looking at the code from a, you know, slightly
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+detached perspective and trying to figure out whether the code can
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+be made simpler, more maintainable, more efficient. And interestingly, there are
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+measurements, there are studies that
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+suggest that development productivity with pair
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+programming is similar to that of two people
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+working independently. And that answers one of the
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+main objections against pair programming, which is why
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+should I put two developers together, which is
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+going to cut their productivity in half. It is
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+not. Studies shows that that does not happen.
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+And that the resulting code can actually benefit
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+from the fact that two developers are working together.