15.2 Statistical Process Control
Statistical process control involves establishing standards, monitoring standards, taking measurements, and taking corrective action as a product or service is being produced. Samples of process outputs are examined; if they are within acceptable limits, the process is permitted to continue. If they fall outside certain specific ranges, the process is stopped and, typically, the assignable cause is located and removed.
Control charts are graphs that show upper and lower limits for the process we want to control. A control chart is a graphic presentation of data over time. Control charts are constructed ...
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