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The Role of Process Control Limits

August 1, 2017

In my previous column I discussed the role of specification limits in manufacturing, which led to thoughts about process control limits.

Walter Shewhart invented the process control chart while working for Western Electric in the 1920s. He created the basis for the process control chart and the concept of a state of statistical control through the use of natural process limits via designed experiments.

The basic idea of control limits is to periodically sample the process, measure a quality characteristic on a few selected product units, then plot these results (generally average and range) in a time series.

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