Discussion
A design commits \( 65 \) per cent of lifetime cost in conceptual design and a further \( 20 \) per cent in preliminary design. By the end of preliminary design the committed fraction is
Answer: D
Correct answer: 85 per cent
The commitments accumulate:
\[ 65 + 20 = 85\% \]By the end of preliminary design more than four fifths of the lifetime cost is locked in, while the great majority of the money has still not been spent. Everything after that point is executing decisions already taken, which is why the design review gates at the end of each phase are treated so seriously.
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