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Discussion

A selection is documented in a matrix of candidates against criteria chiefly so that

  • A.the reasoning survives for the next revision of the product
  • B.the vendor can be shown that its part was considered
  • C.the purchasing department can negotiate a better price
  • D.the certification body can verify the calculation

Answer: A

Two years later nobody remembers why the part was chosen, and the matrix is what prevents the same investigation being repeated or a constraint being forgotten in a redesign. It is cheap to write and expensive to omit.

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