AQL settings

Six Sigma – iSixSigma Forums Old Forums General AQL settings

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    Hello folks. Is there any standard for AQL settings for different types of defects? maybe according to their impact on security, functionality, etc… I’m developing an inspection manual but have been facing problems in the AQL setting for each defect.   Any ideas?? Thank you



    My idea is what does doing inspections to an AQL level have to do with Six Sigma? The ideas are light years apart.


    Robert Butler

    AQL’s are usually determined by the customer.  In my field (areospace) they are driven not by type of defect but by characteristic definition.  For all of our customers the most severe characteristic definition is “critical”. “Critical” is defined as a characteristic whose non-conformance will result in a failure of the performance of the manufactured item.  Any characteristic that meets this requirement has a stipulated inspection frequency of 100%.
      After “critical” there are other categories which go by various names depending on customer or supplier.  Two fairly common labels are “Major” and “Minor”.  While the labels are common the definitions aren’t and with each customer/supplier the AQL’s vary along with the definitions.  It is not unusual to have an AQL for one individual’s “Minor” characteristic which is higher than someone else’s “Major” characteristic even though the form, fit, and function of the two parts are similar.
      So, the short answer to your question is that within a given industry there may be an agreed upon set of defect definitions and associated AQL’s but to the best of my knowledge there is no general connection between AQL’s and product properties or defects.

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