So, processes, where the mean is minimum 6σ away from the closest specification limit, are aimed at Six Sigma.Ĭredit: Cmglee, via Wiki Creative Commons CC BY-SA 3.0 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. This is achieved by using a structured approach called DMAIC (Define, Measure, Analyze, Improve, Control) to identify and eliminate causes of variation and improve processes. The goal of Six Sigma is to achieve a level of quality that is nearly perfect, with only 3.4 defects per million opportunities. Six Sigma is a set of methodologies and tools used to improve business processes by reducing defects and errors, minimizing variation, and increasing quality and efficiency. Learn automation, data analysis, and more to thrive in the technology-driven world.Ĭheck out this video to know more about Six Sigma: It is used in industries such as manufacturing, healthcare, finance, and service industries to improve customer satisfaction, reduce costs, and increase profits.ĭiscover the power of non-coding skills with Simplilearn's non-coding courses. Six Sigma was developed by Motorola in the 1980s, and it has since been adopted by many other companies around the world, including General Electric, Toyota, and Amazon. A process that operates at six sigma has a failure rate of only 0.00034%, which means it produces virtually no defects. The term "Six Sigma" refers to a statistical measure of how far a process deviates from perfection.
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