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Judgment & ambiguity · When to act

Your SPC chart on a critical dimension shows seven points in a row trending up but still inside the control limits. The line is running clean and orders are behind. When do you stop the line, and when do you keep running?

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A seven-point run is a rule violation even though no point is out of limits — that's exactly what SPC is for, catching the shift before it makes scrap.

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