An AQL inspection uses an agreed sampling plan to decide whether to accept a production lot, but the number itself is not a universal 'allowed defect percentage'. Buyers should agree on the edition of the sampling standard, inspection level and defect classes before production.
For a production-control plan, assign responsibility for lot formation and document the decisions around follow-up actions.
Key technical and sourcing choices
What AQL means
AQL is an acceptance quality limit within a sampling system. It is not a promise that the exact proportion of defective pieces in a shipment equals the chosen number.
Standard and edition
Reference the applicable documented scheme, such as ISO 2859-1, including the agreed edition. The sampling tables and switching rules are part of the specification.
Lot formation
Define how styles, colors, sizes and production batches form inspection lots. Combining unrelated groups can hide problems concentrated in a single style.
Defect classes
Critical, major and minor categories require written examples. A cosmetic color variation may be major for a premium brand but minor under a different agreed brief.
Inspection conditions
Agree sample selection, measurement methods, defect photography and packaging checks. AQL cannot replace detailed product specifications.
Follow-up actions
Define rework, re-inspection and shipment-release rules if a lot fails. The purchase order should say who decides and how costs are handled.
An illustrative purchase-order scenario
A buyer writes 'AQL 2.5' in an email and assumes the factory will inspect every garment. In reality, the inspection process needs a defined lot size, sample-size code, defect definitions and acceptance/rejection rules.
Illustrative example only; not a verified customer project.
Cost, timing and supplier comparison
The buyer and supplier need to agree what evidence is required for standard and edition and defect classes, rather than assuming a final inspection alone will uncover every issue.
Assign time and responsibility for follow-up actions in advance.
A practical approval sequence
- Specify the agreed standard and edition. Define lot boundaries, lot sizes, inspection level and defect categories in the purchase order. Confirm the party responsible for sampling and inspection.
- Select the actual sampling plan. Determine the sample size and acceptance/rejection numbers from the agreed standard and current inspection regime. Do not interpret the AQL value as a simple fixed defect percentage.
- Record what the inspector will do. Define random sample selection, classification of observed defects, garment measurements, photographs and how counts are documented for the lot.
- Agree failed-lot handling in advance. Record whether goods will be isolated, corrected, reinspected or held for buyer decision, and who authorizes release to shipment.
Information to include in a factory enquiry
For a useful review of AQL inspection apparel, the factory will usually need more than a style name or one reference image. The buyer can prepare a concise package containing these details:
- Lot size and assortment.
- Applicable AQL standard and edition.
- Inspection level.
- Defect classification.
- Inspection timing.
- Rework and re-inspection plan.
Buyer questions and answers
Is AQL 2.5 a maximum defect rate for every shipment?
No. AQL is a parameter in a documented acceptance-sampling plan. The lot size, inspection level, code letter, inspection regime and acceptance/rejection numbers must be determined under the agreed standard and edition.
Does an AQL inspection mean every garment is checked?
Usually not. Acceptance sampling examines units selected according to a sampling plan. Buyers who need 100% checking of a particular safety or functional characteristic should specify that as a separate requirement.
What should happen if an inspected lot fails?
The purchase order should define segregation, correction, reinspection and shipment-release responsibility. The buyer and supplier should agree those steps before production rather than interpreting a failed sample after goods are packed.
Discuss a custom project with MuseArk Studio
For a production planning or garment QC discussion, share your garment reference, approximate order quantity, colorways and the relevant details: lot size and assortment, applicable aql standard and edition and inspection level.
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