問題文
An auditor is testing a shipbuilder's weld inspection controls. Two tests are proposed. The first checks whether every casting that the model rejected has a recorded engineer's confirmation. The second re-measures a sample of accepted castings against the specification. An auditor is asked what each establishes. Which reply is correct?
選択肢
- Neither establishes anything on its own, so the auditor should combine them into a single test that selects castings and examines both the confirmation record and the measurement for each one, which is the only design capable of supporting a conclusion about this control.
- The first establishes whether the confirmation step was followed as required, and the second establishes whether the accepted castings were in fact within specification, which the first cannot show.
- Re-measuring the castings establishes both, since it covers the outcome and any casting found outside specification would necessarily reveal that the confirmation step had not been performed properly on that occasion.
- Both are established by the first, because a control that was followed produces correct outcomes, and evidence of compliance with the control is therefore also evidence about the castings that passed through it.