iSixSigma

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How Tzek Chong

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Remember Common Cause Variation in Fight Against Waste

Ideally, practitioners want an error rate to be at 0 percent. But if an error rate is steadily hovering at about 2 percent, it is fair to say that the errors are due to common cause variation. If the error rate suddenly surges beyond its usual level, however, it is probably due to some change…