STATISTICAL PROCESS CONTROL CHART
A statistical process control (SPC) chart graphically displays data about some process or product. The data, based upon samples or observations, are collected over a period of time. The data, when plotted, should fall within an acceptable range, or tolerance level. Any data falling outside that range may indicate a problem or an opportunity for improvement.
A SPC chart provides several benefits. It provides for effective monitoring of processes. It also helps to identify problems when they arise. Further, it aids in capitalizing on anomalies that may, in fact, lead to better processes or products.
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