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Walter A. Shewhart
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Walter Andrew Shewhart was an American physicist, engineer and statistician. He is sometimes also known as the grandfather of statistical quality control, inventor of the Shewhart chart and the Shewha
Shewhart in April 1920
Shewhart in April 1920
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
Walter A. Shewhart
…shoe-heart"; March 18, 1891 – March 11, 1967) was an American physicist, engineer and statistician. He is sometimes also known as the grandfather of statistical quality control, inventor of the Shewhart chart and the Shewhart cycle. W. Edwards Deming said of him…
Simple example of a process control chart, tracking the etch (removal) rate of Silicon in an ICP Plasma Etcher at a microelectronics waferfab. Time-se
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.