Acceptance Quality Limit (AQL)

Posted in Operations and Supply Chain Terms, Total Reads: 526
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Definition: Acceptance Quality Limit (AQL)

It is defined as the worst quality level in a process that is considered to be acceptable for a product from a given sample size in a particular lot or population size. In other words it is the maximum number of defective goods or non-conformities acceptable for a client in a sample size.


Mathematical Expression

Non Conformities per 100 items is expressed as one hundred times the number of non-conformities in a lot or population divided by lot or population size


100p=100 D/N

 

Where p= number of non-conformities per item

D=number of non-conformities per item

N=lot or population size


Explanation and Examples

AQL levels differ according to the product you are manufacturing and market you will supply the product.

Product

AQL level (European Standards)

AQL level (US Standards)

Medical Examination Gloves

1.5%

2.5%

 

Defect Types

Defects are classified into three major categories which are as follows


Critical Defects

No Critical defects are accepted i.e. AQL 0 as it might result to unsafe conditions or are against mandatory regulatory norms


Major Defects

Reduces the usability of the product. An AQL level 2.5 is acceptable


Minor Defects

It is a defect beyond set quality standards but the product is deemed to be usable. An AQL level 4.0 is acceptable

 

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