Deming had advocated popular quality improvement methods such as Total Quality Management (TQM), Plan-Do-Check-Act methodology, 14 point rules and elimination of 7 deadly sins and he helped organizations to achieve operational excellence with much customer focus. Later many US companies have gained much from Japanese experiences and ideas on quality improvement concepts. The Six Sigma concepts and tools used can be traced back to sound mathematical and management principles of Gauss, Taylor, Gilberth and Ford for their contributions like Sigma and Normal distribution (Gaussian distribution),Taylor's Scientific Management, Gilberth's 'Time and Motion study' and Ford's mass production of cars using 'Assembly line ' system. Six Sigma when coupled with 'Lean Principles' is called 'Lean Six Sigma' which professes eliminating waste in process steps by using 'Lean Tools' which is based on Toyota Production System(TPS) which enhances value in Six Sigma implementation one step further by increasing speed by identifying and removing non-value adding steps in a process. Execution of Lean Six Sigma project uses a structured method of approaching problem solving normally described by acronym 'DMAIC' which stands for Define, Measure, Analyze, Improve and Control.
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