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FIGURE 20-22. The control chart and the normal curve.

charts is to distinguish between the inherent, random variability of a process and the variability attributed to an assignable cause. The sources of random variability are often referred to as common causes. These are the sources that cannot be changed readily, without significant restructuring of the process. Special cause variability, by contrast, is subject to correction within the process under process control.

• Common cause variability or variation: This source of random variation is always present in any process. It is that part of the variability inherent in the process it-

TABLE 20-4. ATTRIBUTES OF THE NORMAL (STANDARD) DISTRIBUTION
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