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Assertion (A): Design margin is allocated and tracked explicitly from the start of a programme.

Reason (R): Weight and performance almost always deteriorate as detail design proceeds.

Select the correct answer from the options below.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason is why the practice exists. Weight grows and performance erodes as detail design uncovers what the concept estimate missed - brackets, fasteners, wiring, access provisions. A margin allocated and tracked from the start absorbs that growth, and tracking it makes the consumption visible while there is still time to act. Margin that is merely assumed is invariably found to have been spent already.

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