Nonconforming Items

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Nonconforming Items: The nonconformity of an item is expressed as the percent of nonconforming items. When each item can contain more than one defect, the nonconformity of an item is expressed as the number of non-conformities (defects) per 100 items.

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Quality is not an act, it is a habit.

— Aristotle

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Practical Acceptance Sampling (2nd Edition) is a hands-on introduction to the inspection of products and services for quality assurance using statistically-based sampling plans.

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Methods are illustrated using SQC Online, Microsoft Excel, and online calculators.

From the Glossary

Acceptable Quality Level

The maximal percent of nonconforming items (or the maximal number of nonconformities per 100 items), which is considered, for inspection purposes, as a satisfying process mean.

The AQL is generally specified by the authority responsible of sampling. Different AQLs may be designated for different types of defects. It is common to use an AQL of 1% for major defects, and 2.5% for minor defects.

Values of AQL that are 10% or less are suitable for percent nonconforming or nonconformities per 100 items. Values of AQL over 10% are only suitable for nonconformities per 100 items.

Nonconforming Items

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From the Glossary