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That’s a great question. For capability, I’d go with the Histogram. It’s easy to add the customer requirements to the graph and get a visual on how many times the process fails to meet the specifications. The I-MR Chart is a Control Chart, so it provides a visual on whether there is special cause variation. The Histogram…
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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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