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A non-functional requirement is one that specifies

  • A.the choice of processor and peripherals
  • B.how well the system must behave rather than what it must do
  • C.a function that the system need not implement at all
  • D.the internal structure of the software

Answer: B

Response time, power consumption, temperature range and mean time between failures are all of this kind, and they constrain the architecture at least as much as the functional list. They are also the requirements most often left unstated and discovered late.

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