Distinguish common-cause variation from special-cause signals before adjusting a food or beverage process.
The move: adjust on signals, not nerves. Common cause is the voice of the current process If a sauce filler runs between 497 ml and 503 ml while all points stay inside the expected pattern, the process is speaking in its normal range. That does not mean the process is perfect. It means the current system is producing this amount of variation. A setting change without a signal often adds noise because it responds to randomness as if it were a cause. Special cause is a pattern worth stopping for A control chart helps operators see when the system may…
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