Common Causes of Variation
Common causes are problems inherent in the system itself. They are always present and effect the output of the process. Examples of common causes of variation are poor training, inappropriate production methods, and poor workstation design.
As we can see, common causes of variation are more critical on the manufacturing process than special causes. In fact Dr. Deming suggests that about 80 to 85% of all the problems encountered in production processes are caused by common causes, while only
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