Do not chase noise on the control chart
Use control chart signals to decide when a laboratory process needs investigation instead of routine observation.
The move: respond to signals, not feelings. Control charts plot process data over time with a centerline and control limits. They help a lab decide whether current variation is expected or unusual. The key distinction is common cause versus special cause. A manager needs predefined action rules. Without rules, each QC review becomes a personality test. One person repeats everything, another releases too easily, and the bench learns inconsistency. With rules, the team can act quickly and explain why. Before: every near-limit point creates a scramble. After: only defined signals trigger investigation.
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