When a supplier asks to rework defective goods, you must choose between immediate acceptance, conditional approval, or formal rejection. The right choice depends on the defect type, the rework method, the affected sample or batch, the inspection evidence, and who covers time and cost. This article gives a working method you can use to ask the right questions, document the outcome in a Product Change Log, and produce a clear Rework Approval Checklist so each decision is auditable.

Triage the defect against your product requirements

Start by comparing the defect to the original technical specifications, purchase order tolerances, and any approved samples. Ask the supplier to identify whether the issue is cosmetic, functional, safety-related, or a packaging/label problem. For each category, note whether the defect affects fit, form, function, material, or branding.

Next, decide whether the defect is isolated to a single unit, a sample, a lot, or the whole production run. The scale matters. A single cosmetic blemish can be handled differently from a batch-level tolerance failure. Record the sample serial numbers, photos, and measured values so later comparisons are possible.

• Ask: Which spec clause does this fail against? Provide clause reference or sample ID.
• Record: sample serial, date, location, and high-resolution photos with a scale.
• Decide: isolated unit, sample lot, or full batch?

Assess the proposed rework method and its impact

Request a written rework proposal from the supplier detailing steps, materials, tooling, expected outcomes, and time required. The proposal should identify whether the rework alters materials, assembly sequence, or any visible branding. Compare the proposed method to previously approved repair procedures in your quality plan, if any.

Evaluate impact on product performance and warranty. Ask the supplier to explain how they will verify the rework and which inspection points they will re-check. If the fix could change tolerances, electrical properties, finishes, or sealing, you may need lab or functional testing before approving the work.

• Require: sequence of operations, new materials, re-test plan, and estimated hours.
• Check: does the method change material or permanent fit/finish?
• Decide: will you require sample re-inspection or third-party testing after rework?

Decide who pays and how schedule changes are handled

Clarify financial responsibility and schedule impact before any work begins. If the defect stems from the supplier's process, the supplier typically absorbs rework hours and scrap. If the defect was due to an ambiguous spec or buyer-provided sample, costs may be negotiable. Record the position in writing and, if appropriate, note it on the Rework Approval Checklist.

Establish revised delivery dates and whether the work on the affected units affects the rest of the order. Ask for a recovery plan that shows throughput after rework, shipment milestones, and any buffer stock. Make approval conditional if the supplier cannot commit to dates that meet your downstream needs.

• Obtain supplier confirmation of who pays and a cost estimate before starting rework.
• Require a new schedule with checkpoints and delivery windows.
• Mark any changes to payment terms, penalties, or partial shipment options.

Specify inspection evidence and sample governance

Be explicit about what evidence you require to accept reworked units. Common evidence includes tagged before-and-after photos with scale, measurement readouts, test reports, and a reworked-sample held in quarantine for buyer review. State whether you need factory inspection, third-party inspection, or laboratory testing and which criteria determine pass or fail.

Decide how many samples you need for validation and who will sign off. For critical features, require a control sample returned to your control or held by a neutral inspector. Add acceptance criteria to the Product Change Log so every rework decision references objective measurements rather than impressions.

• Define required evidence: photos, measurement sheets, test reports, inspector name and date.
• State sample size for validation and where samples will be stored for buyer review.
• Record pass/fail criteria numerically, more than as 'looks acceptable.'

Use a Rework Approval Checklist and Product Change Log

Turn the decision into a short checklist that the supplier and buyer both sign before work starts. The checklist should capture defect description, rework steps, who pays, schedule impact, inspection evidence required, sample retention, and final acceptance criteria. Keep the checklist attached to the Purchase Order and to any inspection reports.

Maintain a Product Change Log entry for every rework incident. The log should record timestamps, participants, multiple revision states, and the final disposition: accept as-is, accept after rework, partial acceptance with credit, or reject and rework at supplier cost. This audit trail makes it possible to compare later deviations and to inform future contract clauses.

• Checklist items: defect reference, rework method, cost allocation, schedule, evidence, sign-offs.
• Product Change Log: unique ID, dates, photos, approvals, and final disposition.
• Keep documents accessible to procurement, quality, and operations teams.

When to approve immediately, allow supplier action, or escalate

Allow supplier-led rework without explicit buyer approval only when the defect and repair are covered by pre-agreed procedures and the change will not affect core specifications, safety, or branding. Examples include minor surface touch-ups within an accepted tolerance or routine cosmetic polish already documented in your repair procedures. Even then, require evidence after the fact.

Require formal buyer approval when the rework modifies materials, function, assembly sequence, branding, or warranty; when the cost or lead time impact exceeds pre-agreed thresholds; or when the defect affects safety, compliance, or product performance. Escalate to your quality manager or category lead if the proposed fix is unclear, if testing is required, or if the supplier resists documenting costs and schedule implications.

• Allow immediate action: pre-approved minor repairs with low impact and mandatory post-evidence.
• Require approval: changes to fit, function, materials, branding, warranty, or compliance risks.
• Escalate: unclear proposals, disputed responsibility, or high-cost/time impacts.

Download or create a one-page Rework Approval Checklist and use it for the next supplier rework request.