CHAPTER 7

Process Capability

Our work is the presentation of our capabilities.

—Edward Gibbon

The debate over the true definition of quality is as strong as ever with no resolution in sight.1 For the purposes of our discussion of process capability, we will use a definition based on Juran’s fitness for use and Feigenbaum’s best for certain customer conditions.2 Edward Lawson built on Juran’s and Feigenbaum’s work when he crafted his definition of quality as “the degree of excellence with which a product or service fulfills its intended purpose.”3 The intended purpose is defined by the marketplace, according to Lawson, and the intended purpose is translated into specifications that manufacturers use to assure the products they produce meet the ...

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