Care must be exercised when setting and use of process capability indices discussed above. Firstly, the equations presented are appropriate when the data are distributed normally. Secondly, the size of the sample and the method of collection of data from a process can have striking effects on estimates of rates of p. Additionally, problem arises when the requirement of all companies to use process capability metrics, since the service or transaction procedures have not publish specifications that are similar to those in the construction. (Breyfogle et al 2001)
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