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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.
A six sigma level of performance has 3.4 defects per million opportunities (3.4 DPMO). A current six sigma process now will have a estimated shift of 1.5 sigma (lower) in the future and will perform at a 4.5 sigma level, which produces 3.4 DPMO.