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-The next practice I want to discuss is a very important one

-

-2

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-in XP, and also one of the scandal, controversial, and it's

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-3

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-the practice of pair programming. What does it mean? It means

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-4

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-that all production code is written with two people looking at one

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-5

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-machine. And not that they're, they're working with one keyboard and

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-6

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-one mouse or they're not just interfering and writing on each other's

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-7

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-code. And the way in which that happens is by playing

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-8

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-different roles at different times. So the two developers alternate between the

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-9

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-role of programming and strategizing, where strategizing means, for example,

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-10

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-looking at the code that has been written and thinking whether

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-11

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-that would work. Or what other tests that are not there

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-12

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-might not work, given the way the code is being written.

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-13

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-Or maybe looking at the code from a, you know, slightly

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-14

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-detached perspective and trying to figure out whether the code can

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-15

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-be made simpler, more maintainable, more efficient. And interestingly, there are

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-16

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-measurements, there are studies that

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-17

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-suggest that development productivity with pair

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-18

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-programming is similar to that of two people

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-19

-00:00:52,550 --> 00:00:55,080

-working independently. And that answers one of the

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-20

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-main objections against pair programming, which is why

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-21

-00:00:57,740 --> 00:00:59,840

-should I put two developers together, which is

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-22

-00:00:59,840 --> 00:01:01,860

-going to cut their productivity in half. It is

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-23

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-not. Studies shows that that does not happen.

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-24

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-And that the resulting code can actually benefit

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-25

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-from the fact that two developers are working together.