Six Sigma (6σ) is a set of techniques and tools for process improvement.
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Six Sigma strategies seek 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. Source :https://en.wikipedia.org/wiki/Six_Sigma