changed the focus of quality within the US, from one where quality levels were measured in percentages (parts per hundred) to a discussion of parts per million or even parts per billion. It was not long before many of the US giants - Xerox, Boeing, GE, Kodak - were following Motorola's lead. While few dispute this history, one area of confusion is the interpretation of the term six sigma. The original industrial terminology is based on the established statistical approach which uses a sigma measurement…
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