Six Sigma SPC - Statistical Process Control

Six Sigma SPC's Quality Control Dictionary and Glossary
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AQL - Acceptable Quality Level

This is usually defined as the worst case quality level, in percentage or ratio, that is still considered acceptable. QA, (Quality Assurance), may be in charge of monitoring AQLs'.

If a produced unit can have a number of different defects, then demerits can be assigned to each type of defect and product quality measured in terms of demerits. As an AQL is an acceptable level, the probability of acceptance for an AQL lot should be high. (Typical values between 92.74% to 99.999996% for six sigma, see Cpk compares to PPM for value reasons)

Some sources characterize an acceptable quality level as the highest percent defective that should be considered reasonable as the process average.

Usually monitored using SPC, (Statistical Process Control), at the production levels by Quality inspection.

Standard military sampling procedures, (MIL-STD), have been used for over 50 years to achieve these goals. The MIL-STD defines AQL as...

 "the maximum percent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average."

For more information on MIL-STD see Choosing a Sampling Plan: MIL Standard 105D.

Also see RQL - Rejectable quality level

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Last Updated: Monday, 06-Mar-06 04:04:13 PST