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Overview of Six Sigma Six Sigma is set of techniques or set of management techniques carried out to improve business processes by reducing the probability that an error and defect will occur. Six Sigma is a disciplined, using statistical based data driven approach and also a continuous improvement methodology for eliminating defects in a product, process or service. Six Sigma methodology firstly developed by Motorola and company then it became popular when General Electric achieve the excellence in business by applying Six Sigma Methodology in the early 1990's. Now there are thousands of company in the world who are adopted Six Sigma as a way of doing of business. Principles of Six Sigma: Success of Six Sigma implementation is based upon five main principles: • Concentrating on customer requirements • Using accurate measurements to do errorless statistical analysis to understand improvement opportunities for building a solution for identification of root cause of problems (variat...