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A team proposes skipping conceptual design to save schedule. The proposal is

  • A.Sound if the aircraft is a derivative
  • B.Unsound only for military programmes
  • C.Unsound; it commits most lifetime cost
  • D.Sound

Answer: C

Correct answer: Unsound; it commits most lifetime cost

Skipping the phase does not remove the decisions it makes; it only makes them implicitly, without exploring alternatives, while still committing the great majority of the lifetime cost. The schedule saved is a few per cent of the budget, and the exposure is the other sixty-five. A derivative programme can legitimately run a much shorter conceptual phase, since the configuration is inherited and only the changes need exploring - but that is compressing the phase, not skipping it.

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