technical meaning of the quality policy "6 Sigma" is to measure performance, and to determine how many Sigma there compared with the current average of a sample. The limits of the specifications and tolerances, or even the performance range of products or services are determined mainly by the resentments of clients. the scope of the specification consists of the lower limit and the upper limit of the specification. because volatility is real and inevitable for a product, a service, or a process, the ideal price range is located in the Centre of the curve
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