The exact pi sigma delta Rho / Rho iota sigma iota iota Omicron tau kappa Omicron "Sigma" is a letter of the Greek alphabet, indicates that the fixed bias "," descriptive statistics, variation as a measuring instrument of enterprise. 6 marks the mean standard deviation from the number of defects, and thus there are 34 thousand (DPM). Thus, the combination of attention is the goal of reducing variability and accuracy while increasing. This is accomplished by the use of data or index (about a specific product or service or production of defective parts to other aspects of the business process), to analyze the cause and the harm of the defects, thus the emergence of the past and lack of correction.Some writers believe that the policy has begun to pay attention to quality, the establishment of statistical methods in a broader change in the process of management philosophy.
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