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The “Y” is the main measure of what you’re trying to improve. When conducting process improvement, you’re trying to understand the root causes or “X”s that influence “Y.” On a Box Plot, the “X”s are the different columns or “stratifications”…
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Elisabeth Swan

Elisabeth is a Master Black Belt at, 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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