Definition and context
AQL indexes a sampling scheme for a continuing series of lots. Agree the standard, inspection level, inspection mode and AQL before selecting the sample.
Select the plan before inspection
Use the lot size and inspection level to find the code letter, then follow the applicable table to obtain the sample size and acceptance and rejection numbers. Do not multiply the AQL percentage by the sample size to calculate the acceptance number.
Understand the decision
Compare the observed count with the selected plan. Specify whether you count nonconforming units or nonconformities. Sampling can accept a poor lot or reject a good lot; an accepted sample does not prove every unit is defect-free. Agree separate rules for critical defects.
Where this term fits in the workflow
AQL (Acceptance Quality Limit) is usually shown in the inspection and sampling.
Terms used when teams decide what to inspect, how much to sample, and whether a lot can ship.
What is KaizenQ?
KaizenQ helps factory teams record inspection results, defect photos, and notes in one report shared with the office.
Learn more
Key takeaways
- AQL is not the maximum defect percentage allowed in each lot.
- Use the complete sampling scheme, including applicable switching rules.