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So let's go back again to our domain, with

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all the sub-domains identified. And the basic idea, or the

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intuitive idea I was talking about, is that errors tend

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to occur at the boundary of a domain, or a

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sub-domain. Like in this case. And why? Because these

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are the cases that are less understood by the developers.

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Like for example, the last iteration of a loop, or

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a special value like zero for integers. So if this

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is true, what we want to do is to select inputs at these

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boundaries. And this is complementary to partition

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testing, in the sense that partition testing

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will identify the partitions in which we want to select inputs, and boundary

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testing. So the selection of boundary values

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will help select inputs in these partitions.