Is the exposure bounded?
Identify the affected characteristic, requirement, actual result, lots and discovery point. Check potentially affected stock, work in progress, shipped product and related products. Record the basis for exclusions.
SUPPLIER QUALITY
Beyond an 8D report:
evidence before closure
A completed report records a response. A closure decision needs evidence that the action addresses the verified cause and works under relevant operating conditions.
Start with the closure decision
Review a supplier response against the specific defect, exposure and agreed requirements. Separate immediate protection from lasting corrective action. An attractive report or a signed training record alone cannot establish effectiveness.
This is an original practical review method, not an official 8D form or a substitute for applicable customer, contractual or standard requirements.
Six review questions
Does containment protect the next delivery?
Check isolation, identification, screening capability and communication responsibilities. Confirm implementation evidence at relevant locations and define who can change the temporary controls.
Are occurrence and escape causes supported?
Ask why the defect occurred and why existing controls did not detect or prevent its escape. Distinguish a hypothesis from a cause supported by observations, comparisons or controlled checks.
Does each action address a cause?
Link the action to the verified mechanism. Training may be appropriate when evidence identifies a knowledge or competence gap. It cannot compensate for an unresolved fixture or measurement problem.
Was the change implemented and effective?
Check the revised method, responsible owner and dated implementation evidence. Then assess results against a predefined effectiveness criterion under representative production conditions.
Is closure justified?
Record remaining uncertainties, the authorized decision and any continued controls. Consider related processes, supplier risk, performance monitoring and escalation when recurrence or severity warrants it.
A synthetic example: repeat dimensional drift
A supplier proposes retraining after repeated dimensional drift. Investigation instead finds inconsistent fixture seating; a separate review finds that the inspection setup can miss the shift. A credible response addresses both mechanisms, records implementation and checks performance across the conditions implicated in the failure.
Agree the characteristic, acceptance criterion, measurement method, observation window and production exposure before reviewing effectiveness. For intermittent defects, a short period without recurrence may provide little evidence. There is no universal “three lots means effective” rule in this method.
If implementation is complete but the planned observation window is still running, record “effectiveness pending” and retain appropriate controls. If evidence contradicts the proposed cause, return to the investigation rather than closing on paperwork.
Make the evidence review repeatable
The free sheet separates the supplier claim, evidence reference, review gap and follow-up owner. It supports a reasoned decision; it does not calculate a compliance score.
Open the Supplier 8D Review SheetPlanned: an expanded toolkit with synthetic worked examples and review guidance. Availability and any specialist service will be announced after release review.
FROM KNOWLEDGE TO PRACTICE
Bring corrective-action evidence into your internal audit
For AS9100D internal audits, connect findings and objective evidence to containment, root cause, corrective action and effectiveness verification with the toolkit’s CAPA follow-up system.
Independent professional audit toolkit · Editable Excel · English + Traditional Chinese
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