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1
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Looking at the requirements, and knowing that we have only two
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that we can satisfy for sure, it makes sense to first mark
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as mandatory the ability to withdraw cash, which is the most typical
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use of an ATM machine. We are therefore going to mark this requirement
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with an M, for mandatory. It also makes sense to mark as
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mandatory the fact that the ATM system checks the PIN of the
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card being used by the customer, as that's the typical level of
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security that the customer would expect,
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therefore we're going to mark as mandatory
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also the first requirement here. And of course we
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could also perform biometric verification, but based on our knowledge
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of the domain, it seems like that should be
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an additional verification, rather than the main and only verification
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for the system. We will therefore mark it superfluous.
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That is something that we can postpone until a later
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release, the second requirement. Finally,
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another typical operation that customers
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perform at ATM machines is depositing. Whereas changing an ATM
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card's PIN is not such a common operation. We'll therefore mark
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it nice to have this fourth requirement and as superfluous, the
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last one. So at the end, what we have is that
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we have two mandatory requirements which are the two that we can
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satisfy for sure. One, nice to have the requirement, which is
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the possible third requirement which we might have time to satisfy. And
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the other two that are marked as superfluous, as something that
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we might do later, for example in a subsequent release. And of
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course there is something subjective in these answers. But
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again, based on our knowledge on our understanding of
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the domain, these are the one that makes more
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sense for an ATM system as we know it.
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