Acceptable Quality Level (AQL) is the set number of defective products that are acceptable for a selected sample size. As long as the production level yields to defective pieces within the AQL range then it means that manufacturing is going on a smooth basis.
But if it is higher than the set AQL then the manufacturing processes will have to be reviewed and the defect causing areas have to be rectified. It is an important tool in Six Sigma quality control.
AQL depends and differs from product to product and from industry to industry. Products used in building airplanes will have very less AQL as compared to a company that manufactures toys. Hence, it is first essential that the AQL is calculated based on the appropriate size and sample.
The defects are then categorized as negligible, minor and major ones. Accordingly, when the sampling is done if the statistical values lie below the expected AQL then the products are accepted.
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