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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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Elisabeth Swan

Elisabeth is a Master Black Belt at GoLeanSixSigma.com, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. For over 30 years, she's helped leading organizations like Amazon, Charles Schwab and Marriott International, Inc. build problem-solving muscles with Lean Six Sigma to achieve their goals.
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