Sampling for Quality Inspection and Correction: AOQL (Average Outgoing Quality Limit) Performance Criteria (Version 3)

摘要

The Average Outgoing Quality Limit (AOQL) is a property of a sampling plan leading to inspection of the whole population, if the sample shows a number of defective items k exceeding an acceptance number k sub o. The literature shows how this constant k sub o can be chosen such that the expected value of approx. p sub m the fraction of defectives after inspection andd possible correction, does not exceed a prespecified constant approx p sub m. The present paper estimates several other criteria ignored in the literature. These estimates are based on an extensive Monte Carlo simulation. The main conclusion is that the AOQL scheme is useful in practice, including applications in auditing. The paper further investigates the effects of splitting the yearly population into subpopulations and the effects of underestimating p, as is often done in practice.