Explain common-cause versus special-cause variation in a way that guides action without panic.
Ramon R Operations lead 1 Concern 2 Signal 3 Action Chart review 20 sec The spike The weekly defect rate rose from 1.1% to 1.4%, still inside control limits with no run pattern. Reacting to noise can add cost and make the process less stable. The formula 1 min SPC coaching Concern -> Rule -> Right action
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