Six Sigma Quality Control: Six Sigma quality control consists of a disciplined, statistics-based system aimed at producing not more than 3.4 defects per million iterations for any business process – from manufacturing to customer transactions. The Six Sigma process of define, measure, analyze, improve, and control (DMAIC) is an improvement system for existing processes falling below specification and needing incremental improvement. The Six Sigma process of define, measure, analyze, design, and verify (DMADV) is an improvement system used to develop new processes or products at Six Sigma quality levels. Both Six Sigma processes are executed by personnel who have earned Six Sigma “green belts” and Six Sigma “black belts” and are overseen by personnel who have completed Six Sigma “master black belt” training. The statistical thinking underlying Six Sigma is based on the following three principles: all work is a process, all processes have variability, and all processes create data that explains variability. Six Sigma’s DMAIC process is a particularly good vehicle for improving performance when there are wide variations in how well an activity is performed. A problem tailor-made for Six Sigma occurs in the insurance industry, where it is common for top agents to outsell poor agents by a factor of 10 to 1.
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