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Judgment & ambiguity · When to act

A key supplier's control charts on a critical dimension are drifting — every part still passes, but the process is trending toward the limit and their Cpk is quietly eroding. When do you trigger supplier corrective action or start qualifying a second source?

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Passing parts with an eroding Cpk is a warning I act on before the first reject, not after — by the time a part fails, I've already lost the cushion and possibly a shipment.

The full answer: structure, worked example, likely follow-up.

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