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Errors In Six Sigma Process. The six sigma and lean manufacturing process can be very hard to understand for a lot of people. Six is nothing but an indicator, an acceptable error rate. For exemplification, the companies that operate on the Sigma level 1 perform correctly in a 30 percent proportion. The Sigma number grows as the performance ameliorates.
Right away you can see that one way to differentiate 3 Sigma vs. 6 Sigma is the defect rate, but that is not the full meaning of the difference between the terms. Take a look at Six Sigma and then see how it compares to Three Sigma in common usage. Image Credit: Wikimedia Commons/Tizio.