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Six Sigma Essay title: Six Sigma Six Sigma Some say, Robert Galvin invented Six Sigma in the 1880’s, instead, he applied methodologies that had been available since the 1920’s developed by luminaries such as: Shewhart, Deming, Juran, Ishikawa, Ohno, Shingo, Taguchi, and Shainin. The idea behind Six Sigma is you can measure how many defects.