![]() In the same paper, Shewhart pointed out the limitations of these types of quality. That quality that makes a thing wantable by some one or more persons. That that characterizes a thing A in its relation to another thing B as a part of a whole and independent of human volition and interest.ģ. That quality that characterizes a thing itself independent of all other things and of human volition and interest.Ģ. In a 1934 paper, Walter Shewhart (the father of Statistical Process Control) defined three types of quality1:ġ. Process capability is the theoretical foundation for Six Sigma metrics, so we will also explore that relationship. In this segment, we will look at concepts associated with an aspect of process performance whose measurement Statistical Process Control makes possible: capability. In the first segment, we looked into the history behind Statistical Process Control in the second, we examined a few of the basic tools. This is the third in a four-part series on Statistical Process Control. ![]()
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