What AQL does and does not do
The buyer and supplier agree the lot definition, sampling plan, inspection level, defect classification, and AQL before production. The inspector selects cartons and pairs randomly, checks the sampled units, totals defects by class, and compares the result with acceptance and rejection numbers.
AQL is a lot-acceptance tool. It does not prove product safety, legal compliance, long-term durability, or the absence of defects outside the sample. Those require specifications, laboratory tests, process controls, and supplier accountability.
A common footwear planning point is AQL 2.5 for major defects and 4.0 for minor defects, with critical defects set at zero tolerance. The actual plan must be written into the purchase order and inspection instruction.
Define critical, major, and minor defects
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| Class | Practical meaning | Footwear examples | Release rule |
|---|---|---|---|
| Critical | Safety, legal, or severe use risk | Sharp object, prohibited substance concern, wrong regulated label, dangerous component | Normally zero tolerance and immediate escalation |
| Major | Likely return, functional failure, or material deviation | Open bond, wrong size, broken hardware, severe shade mismatch, incorrect barcode | Count against major acceptance limit |
| Minor | Small appearance issue not expected to stop normal use | Light removable mark, slight cosmetic variation within a defined boundary | Count against minor acceptance limit |
The list should be product-specific. A cosmetic mark may be minor on a dark trail outsole but major on a premium white upper. Defect class should be agreed before an inspector finds it, not negotiated after a failed report.
Turn the purchase order into an inspection plan
- Lot size, SKU and colorway scope, inspection level, sampling standard, and AQL values.
- Critical, major, and minor defect list with photographs or measurable limits.
- Golden sample, tech pack, bill of materials, size chart, color standards, artwork, and packing instructions.
- Functional checks such as fit dimensions, flex, bonding, logo durability, barcode scan, carton count, and gross weight.
- Required laboratory reports, country-of-origin marks, material labels, warnings, and destination documents.
- Rules for rework, sorting, failed inspection, reinspection, shipment release, and evidence retention.
Give the inspector the latest controlled version. Conflicting artwork or an unsealed sample turns objective inspection into opinion.
Choose inspection timing by risk
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| Stage | Best use | What it can catch |
|---|---|---|
| Pre-production | New material, color, tooling, or supplier risk | Wrong inputs before cutting or molding |
| First article | New model or first order | Construction, fit, process, and setup errors |
| During production | Large, complex, or high-risk order | Systematic defects while rework is still possible |
| Pre-shipment | Finished and packed lot | Random quality, quantity, marks, packing and release decision |
| Container loading | Sensitive count or route | Carton condition, quantity and loading evidence |
For a first order, combine early checks with a final random inspection. Waiting until cartons are closed makes rework slower and creates pressure to accept a weak lot because the vessel date is near.
Footwear checks inside the sampled pairs
- Construction: open seams, skipped stitches, lasting, sole alignment, glue, bond line, foxing, hardware and sharp points.
- Fit and dimensions: size marking, internal length, joint or width references, pair matching, last and sole code, left-right symmetry.
- Appearance: shade, texture, print, logo, panel alignment, wrinkles, contamination, paint, outsole and finish.
- Function: flex, closure, lace and eyelet, removable sockliner, accessories, odor or other agreed checks.
- Packaging: tissue, stuffing, tags, labels, barcode, box mapping, carton marks, quantity, dimensions, weight and sealing.
- Documentation: approved samples, material or test reports, production records and required shipment documents.
Destructive bond or cut-section checks should be authorized and documented so the sample quantity and disposal are clear.
Read the report before releasing shipment
A useful report shows lot size, sampling plan, cartons selected, pairs inspected, defects by class, photographs, measurements, packaging data, and the final result. Review recurring defect patterns, not only the pass or fail label.
- Confirm that the inspector used the correct AQL and lot size.
- Check whether one defect appears repeatedly across colors, sizes, or cartons.
- Separate confirmed defects from observations that need buyer decisions.
- Verify open points, missing tests, or pending documents before payment or release.
- Keep the report with the purchase order, golden sample version, and corrective-action record.
What to do when an inspection fails
A failed inspection should trigger containment before argument. Hold shipment, identify affected lots, review photos and retained samples, and require a root-cause and corrective-action plan. Rework or full sorting should use the same defect definitions as the original inspection.
- Define who performs and pays for rework, sorting, replacement, and reinspection.
- Do not convert major defects to minor simply to obtain a pass.
- Reinspect a newly completed random sample after corrective work.
- Update the process and defect library so the same problem is caught earlier next time.
- Escalate critical or possible compliance defects to qualified specialists immediately.
Release payment and shipment only when the agreed inspection, tests, documents, and corrective actions are complete. An AQL pass does not override a missing legal or safety requirement.
Key takeaways
- Write AQL, sampling and defect classes into the PO before production.
- A common planning point is 2.5 major and 4.0 minor, with critical defects at zero tolerance.
- Use the golden sample and controlled specification as the inspection standard.
- Combine early process checks with a final random inspection on first orders.
- A failed lot needs containment, corrective action, and independent reinspection before release.