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+1
+00:00:00,130 --> 00:00:02,640
+Looking at the requirements, and knowing that we have only two
+
+2
+00:00:02,640 --> 00:00:05,630
+that we can satisfy for sure, it makes sense to first mark
+
+3
+00:00:05,630 --> 00:00:09,080
+as mandatory the ability to withdraw cash, which is the most typical
+
+4
+00:00:09,080 --> 00:00:12,650
+use of an ATM machine. We are therefore going to mark this requirement
+
+5
+00:00:12,650 --> 00:00:15,260
+with an M, for mandatory. It also makes sense to mark as
+
+6
+00:00:15,260 --> 00:00:18,390
+mandatory the fact that the ATM system checks the PIN of the
+
+7
+00:00:18,390 --> 00:00:21,480
+card being used by the customer, as that's the typical level of
+
+8
+00:00:21,480 --> 00:00:23,680
+security that the customer would expect,
+
+9
+00:00:23,680 --> 00:00:25,760
+therefore we're going to mark as mandatory
+
+10
+00:00:25,760 --> 00:00:28,320
+also the first requirement here. And of course we
+
+11
+00:00:28,320 --> 00:00:31,930
+could also perform biometric verification, but based on our knowledge
+
+12
+00:00:31,930 --> 00:00:33,640
+of the domain, it seems like that should be
+
+13
+00:00:33,640 --> 00:00:37,410
+an additional verification, rather than the main and only verification
+
+14
+00:00:37,410 --> 00:00:40,170
+for the system. We will therefore mark it superfluous.
+
+15
+00:00:40,170 --> 00:00:42,720
+That is something that we can postpone until a later
+
+16
+00:00:42,720 --> 00:00:45,100
+release, the second requirement. Finally,
+
+17
+00:00:45,100 --> 00:00:46,740
+another typical operation that customers
+
+18
+00:00:46,740 --> 00:00:51,070
+perform at ATM machines is depositing. Whereas changing an ATM
+
+19
+00:00:51,070 --> 00:00:53,850
+card's PIN is not such a common operation. We'll therefore mark
+
+20
+00:00:53,850 --> 00:00:57,710
+it nice to have this fourth requirement and as superfluous, the
+
+21
+00:00:57,710 --> 00:01:00,420
+last one. So at the end, what we have is that
+
+22
+00:01:00,420 --> 00:01:03,540
+we have two mandatory requirements which are the two that we can
+
+23
+00:01:03,540 --> 00:01:06,280
+satisfy for sure. One, nice to have the requirement, which is
+
+24
+00:01:06,280 --> 00:01:09,960
+the possible third requirement which we might have time to satisfy. And
+
+25
+00:01:09,960 --> 00:01:12,980
+the other two that are marked as superfluous, as something that
+
+26
+00:01:12,980 --> 00:01:16,100
+we might do later, for example in a subsequent release. And of
+
+27
+00:01:16,100 --> 00:01:19,060
+course there is something subjective in these answers. But
+
+28
+00:01:19,060 --> 00:01:22,020
+again, based on our knowledge on our understanding of
+
+29
+00:01:22,020 --> 00:01:23,910
+the domain, these are the one that makes more
+
+30
+00:01:23,910 --> 00:01:26,640
+sense for an ATM system as we know it.