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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.
Because 6 sigma is a higher threshold of quality than 3 sigma is; it's really as simple as that. A 3-sigma standard accepts 99.73% quality in its output - that's an acceptance of an 0.23% error rate. This translates to a 2,700 part-per-million failure rate.