This is based on the popular belief that the “customer is the king.” The primary goal is to bring maximum benefit to the customer. Six Sigma has its foundations in five key principles: Goals are achieved through a two-pronged approach: The concept of Six Sigma has a simple goal – delivering near-perfect goods and services for business transformation for optimal customer satisfaction (CX). So, processes where the mean is minimum 6σ away from the closest specification limit are aimed in Six Sigma. The higher the standard deviation, the higher is the spread of values encountered. The graph of the normal distribution below underscores the statistical assumptions of the Six Sigma model.
If the process has six Sigmas, three above and three below the mean, the defect rate is classified as “extremely low.” “Six Sigma” comes from the bell curve used in statistics, where one Sigma symbolizes a single standard deviation from the mean. The etymology is based on the Greek symbol “sigma” or "σ," a statistical term for measuring process deviation from the process mean or target. It is a data-driven approach which uses a statistical methodology for eliminating defects.
Six Sigma is a set of management tools and techniques designed to improve business by reducing the likelihood of error. Over the years, it has been refined and polished into a sound theory of principles and methods, aimed at business transformation through a clearly defined process. IKeeping in tune with emerging markets and processes, the American company Motorola developed a concept of quality management process in 1986.
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