The distinction that separates a real fix from a temporary one.
When the same defect shows up across consecutive shipments from the same supplier, the instinctive response is often more inspection — tighter sampling, additional sorting, more rework before goods ship. That response manages the immediate problem, but it doesn't explain why the defect keeps recurring in the first place.
A defect that repeats is rarely a one-off mistake; it's usually a signal that something upstream — a machine setting, a material substitution, a training gap, a process step being skipped under schedule pressure — is producing it consistently. Sorting and rework catch the output. They don't touch the cause.
The distinction is the same one that separates corrective action from preventive action: corrective action fixes the batch in front of you; preventive action stops the next one from having the same problem. A buyer seeing a repeat finding across two or three consecutive inspections has a much stronger signal worth investigating than any single finding on its own — it usually means the corrective loop from the last visit didn't actually close.
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