THE QUICK ANSWER
An AQL-based inspection samples part of a production lot against a written defect list and agreed acceptance plan. ISO describes acceptance sampling by attributes as a family of sampling systems. It does not replace product design, process control, laboratory testing or 100% checks for specifically agreed critical features. Buyers should define lot, sample plan, defect classes, measurements and disposition before inspection.
What AQL can and cannot do
Sampling supports a practical accept-or-reject decision without examining every unit. It cannot prove that every item is conforming, and it should not be presented as a certification of general factory quality.
Build a product-specific defect list
A harness may classify an open load-bearing seam, broken buckle or sharp edge differently from a shade variation. A bowl may focus on rim damage, finish, base attachment and capacity. Include photos and measurable tolerances.
Define the lot and the inspection stage
State which purchase order, SKU, color, size, cartons and finished quantity form the lot. Decide whether inspection happens during production, before packing or after the shipment is fully packed. The stage changes what can be observed: a packed inspection can verify labels, carton count and assortment, while an earlier check may make rework easier. Mixed products should not be treated as one undifferentiated lot when their defect lists and checks differ.
Separate functional checks from visual review
Counted measurements, assembly, operation, labeling, carton checks and visual defects need defined methods. If a load, chemical or food-contact claim matters, arrange the appropriate test separately.
Set defect classes before counting
Critical, major and minor are decision categories, not adjectives added after a problem is found. Define them in the inspection plan with product-specific examples. A sharp exposed point, missing safety information or failed load-bearing seam may require a different response from a cosmetic mark, but the classification must match the product, intended use and agreed requirements. State whether any critical defect blocks release regardless of the sampled count.
Keep measurements tied to the specification
List the dimensions, tolerances, sample quantity and measuring method the inspector will use. For graded harness sizes, identify measurement points; for bowls, define usable capacity and rim or base checks; for beds, state finished dimensions, recovery period and fill records. A report that says dimensions checked without showing the specification revision, units and results cannot support a release decision.
Plan disposition before the inspector arrives
State who receives the report, who can authorize rework, how re-inspection is handled and what blocks shipment. Link final release to the approved sample and latest specification revision.
A useful comparison
| Inspection layer | Question |
|---|---|
| Lot definition | Which PO, SKU, colors, sizes, units and cartons form the lot? |
| Inspection stage | During production, before packing or after packing? |
| Sampling plan | Which published or agreed plan and inspection level apply? |
| Defect list | What is critical, major or minor for this product? |
| Measurements | Which points, tolerances, units and methods apply? |
| Functional checks | Which operations or order-specific checks are repeated? |
| Disposition | Who can accept, hold, rework, replace or re-inspect? |
Sources and research context
Community excerpts are anecdotes. Manufacturer guidance applies to that manufacturer’s products. Shortlists are editorial comparisons without hands-on comparative testing or verified sales rankings.
How we research and writeTURN THE ANSWER INTO AN OEM BRIEF
