第三章介绍西格玛水平的计算方法，推导出过程无漂移和有漂移时，西格玛水平与产品不合格品率之间的函数关系式。
Chapter three illustrates how to calculate the sigma level and deduces the function between the sigma level and nonconforming rate whether the process has shift or not.
而六西格玛管理观认为，在过程能力最优的状态，即过程达到六西格玛时，却能降低不合格品率，从而减少企业的成本并增加利润。
But the viewpoint of six sigma is that it can decrease the costs of the enterprises and increase profits when the process is at the six sigma level by reducing the nonconforming rate.
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