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An order of magnitude estimate is prepared to an accuracy of roughly

  • A.plus or minus 30 to 50 per cent
  • B.plus or minus 5 per cent
  • C.plus or minus 1 per cent
  • D.plus or minus 100 per cent or worse

Answer: A

It is made from capacity figures and past projects before any engineering has been done, so it serves only to decide whether an idea is worth pursuing further. Committing funds on such a figure is how projects come to overrun, since the estimate was never intended to bear that weight.

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