Six Sigma (Green Belt, Black Belt, Master Black Belt)
Six sigma is a business management strategy, originally developed by Motorola, that today enjoys wide-spread application in many sectors of industry.

The word ?Sigma? is a Greek letter used for a statistical term that measures how far a given process deviates from perfection(standard deviation).The higher the sigma number, the closer to perfection. One Sigma is not very good, six sigma means only 3.4defects per million.

The Idea behind six sigma is that if you can measure how many ?defects? you have in a process, you can systematically figure out how to eliminate them and get as close to ?zero defects? as possible.
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