CHK.6:2 - Problem

A criterion can be irrelevant, vague or based on a mistaken description. A checker can implement a sensible criterion badly or observe a convenient proxy. Agreement among judges and high aggregate scores can hide the individual failure that matters to the work.

The problem is to examine both the criterion and the means of checking it before placing more reliance on their answers than the evidence supports. This differs from selecting which questions belong in the aid and from checking the actual subject on one occasion.