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Lean Six Sigma Q&A - GoLeanSixSigma.com

What Is An Example Of Special Cause?

Walter Shewhart, who developed Control Charts at Bell Labs in the 1920s, used those charts to distinguish between 2 types of variation. He saw that all processes showed signs of Common Cause variation, but processes that were not in control also exhibited Special Cause variation. If you think about why you’re maybe a few minutes…
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