Zero Acceptance Sampling Plans to Reduce Inspection Costs


  • Features of ANSI/ASQ Z1.4 including the inspection level, AQL, sample size n, and acceptance number c, along with the switching rules prescribed by the standard.
  • Producer’s risk of rejecting a lot at the AQL
  • The operating characteristic (OC) curve, which reflects the chance of accepting a lot whose nonconforming fraction is p. This allows comparison of the c=0 plan to the traditional plan.
  • The c=0 plan as a form of discovery sampling, which calculates the necessary sample size (n) to be a certain percent—in this case, 90%–certain to detect at least one nonconformance if the problem is present at a certain level (in this case, the rejectable quality level).
  • The need for quality to far exceed the AQL due to the higher producer’s risk of rejection of lots at the AQL by c=0 plans. Alternatives such as sequential sampling and narrow limit gauging, both of which reduce the amount of necessary inspection, are available when this requirement is not met.

William A Levinson


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