How to retest a supplier sample after rework

A supplier may fix the visible defect while changing another feature. Retest should begin with the original failure record, then consider what the correction could have affected. Ask for a new sample revision, not an unlabelled replacement.

Verify the correction

Record what changed, why the supplier believes it addresses the cause, and which units or processes are affected. Repeat the failed measurement or functional test under the same method. If a material, tool, or process changed, check related dimensions, appearance, performance, and documentation as appropriate.

Update the approval state

Keep prior test results with their sample IDs; do not overwrite them. State whether the new sample is accepted, rejected, or needs another round. A reworked hand-built sample may not demonstrate the production process, so ask whether a production-intent sample is needed. Carry any approved change into the drawing and purchase order before manufacturing starts.

Worked correction review

Supplier repairs sample S-4 by changing a spring, then sends S-5. Create a new sample review record for S-5; note the change and repeat the original force test. Check fit and durability too if the new spring could affect them. Mark each result separately. Common error: overwriting S-4's failed record with S-5's pass result, which erases why the design changed. Keep both files and update the approved drawing only after the revised sample meets all affected criteria.

Source context: ISO — ISO 9001 quality management systems supports this limited point: ISO 9001 specifies quality-management-system requirements, not a product-specific inspection result. The buyer procedure above is Suppliers Help editorial guidance. Source checked 2026-09-27.