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Necessary Measures

by Johnson, Louis; Deaner, Maureen;

Learn the difference between standard and expanded gage repeatability and reproducibility (R&R) studies and how expanded gage R&R helps clarify measurement system variation....


Results May Not Vary

by Johnson, Louis; McNeilly, Kirk

Controlling manufacturing processes so that products meet customer specifications is difficult. In such situations, factorial experimentation can be the key to understanding the impact of each process input on the process outputs....


Open Access

For Starbucks, It's in the Bag

by Johnson, Louis; Burrows, Sarah

When voice-of-the-customer data showed Starbucks Coffee Co. needed to improve the packaging of its one-pound coffee product, it set out to learn the effects of process parameters on the key packaging quality characteristics....


Calculated Decision

by Johnson, Louis; Sherrill, Robert

When suppliers create control charts and run capability analyses, they assume their data follow a normal distribution. However, the natural distribution of these quality characteristics—and hundreds more like them—is not the normal distribution....


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