AQL (Acceptable Quality Level) standard refers to the maximum number of defective items that could be considered acceptable on a lot. Inspections are based on randomly selected samples, the size or amount of which is determined by AQL standards, which have equivalents in every national and international standard institutes (ANSI / ASQC Z1.4, ISO 2859, NF06-022, BS 6001, DIN 40080). It is represented in tabular form defining the size of the sample to study and the level of acceptance of the sample.
How to use the AQL tables:
Assuming a sample of 5,000 units with a sample of 2 (degree of severity, this one is commonly used by default). The first table refers to a letter corresponding to the size of the sample study appearing in table number 2; here it is 200 units (4% of total sample, depending on the degree of severity). The same table shows that for an AQL of 2.5, the batch can be accepted up to 10 defects highlighted. Beyond, it will be rejected. This corresponds to a rate of defective products of less than 2%.
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| ↓: Use first sampling plan below arrow. If sample size equeals, or exceeds lot or batch size, do 100% inspection
↑: Use first sampling plan above narrow.
Ac : Acceptance number
Re : Rejection number | 
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