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The Concept of Six Sigma begins with a process model and its implementation is called Business Process Management (BPM) and the process of Six Sigma began at Motorola in the 1980's. Six Sigma is the letter ? in the Greek alphabet used to denote Standard deviation, a statistical measurement of variation. Standard deviation can be thought of as a comparison between expected results or outcomes in a group of operations versus those that fail. Bill Smith of Motorola Coined the term Six Sigma and is also called the father of Six Sigma; The Quality leader responsible for the term Total Quality Management is Feigen Baum; robustness in quality management was pioneered by Dr Taguchi; quality leader who did extensive work in Japanese industry is Dr Deming who paved the way for Quality Management Concept; Walter She wart is also one of the contributors in Six Sigma, he is sometimes referred to as father of Statistical Control he introduced the concept of control charts in 1924. In 1920s, contributions by Walter Shewhart, who showed the relation of process corrections based on three sigma deviations from the mean and introduced the control chart and distinction of special versus common cause variation. With Six Sigma Standard deviation we arrive at 3.4 defects per million opportunities or 99.9997 percent this would mean that at six sigma, an airline would only loose three pieces of luggage for every one million passengers that it handles. The Three primary elements of Six Sigma are Customers, Processes & Employees. The Italian Sociologist Vilfredo Alfredo Pareto demonstrated the 80/20 rule which signifies that 80 percent of your outcomes come from 20 percent of your inputs. Pareto 's rule is widely used in Six Sigma principles. Six Sigma is implemented in phases (DMAIC)-Define, Measure, Analyze, Improve and Control