W. Edwards Deming
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William Edwards Deming was an American business theorist, composer, economist, industrial engineer, management consultant, statistician, and writer. Educated initially as an electrical engineer and la
W. Edwards Deming
Statistical process control
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Statistical process control or statistical quality control is the application of statistical methods to monitor and control the quality of a production process. This helps to ensure that the process o
W. Edwards Deming
…Census Bureau. While working under Gen. Douglas MacArthur as a census consultant to the Japanese government, he was asked to teach a short seminar on statistical process control (SPC) methods to members of the Radio Corps, at the invitation of Homer Sarasohn. During this visit, he was contacted by the Union of Japanese Scientists…
Simple example of a process control chart, tracking the etch (removal) rate of Silicon in an ICP Plasma Etcher at a microelectronics waferfab. Time-series data shows the mean value and ±5% bars. A more sophisticated SPC chart may include "control limit" & "spec limit" % lines to indicate whether/what action should be taken.