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Why is graceful degradation a desirable property?

  • A.It allows a system to be shut down safely when a fault occurs
  • B.It reduces the computing resources a system consumes over time
  • C.It ensures the system never produces an incorrect answer at all
  • D.Performance should fall gradually as conditions leave the design envelope

Answer: D

Real conditions always eventually depart from those assumed, and a system whose accuracy declines steadily is far safer than one that fails abruptly and without warning. Knowing when it is outside its competence, and saying so, is better still. Safe shutdown, resource use and infallibility are different properties. Designing for the boundary of the operating envelope rather than only its centre is what separates a deployable system from a demonstration.

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