<P> Six Sigma (6σ) is a set of techniques and tools for process improvement . It was introduced by engineers Bill Smith & Mikel J Harry while working at Motorola in 1986 . Jack Welch made it central to his business strategy at General Electric in 1995 . </P> <P> It seeks to improve the quality of the output of a process by identifying and removing the causes of defects and minimizing variability in manufacturing and business processes . It uses a set of quality management methods, mainly empirical, statistical methods, and creates a special infrastructure of people within the organization who are experts in these methods . Each Six Sigma project carried out within an organization follows a defined sequence of steps and has specific value targets, for example: reduce process cycle time, reduce pollution, reduce costs, increase customer satisfaction, and increase profits . </P> <P> The term Six Sigma (capitalized because it was written that way when registered as a Motorola trademark on December 28, 1993) originated from terminology associated with statistical modeling of manufacturing processes . The maturity of a manufacturing process can be described by a sigma rating indicating its yield or the percentage of defect - free products it creates . A six sigma process is one in which 99.99966% of all opportunities to produce some feature of a part are statistically expected to be free of defects (3.4 defective features per million opportunities). Motorola set a goal of "six sigma" for all of its manufacturing operations, and this goal became a by - word for the management and engineering practices used to achieve it . </P> <P> Six Sigma doctrine asserts: </P>

Where did the name six sigma come from
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