If your production run is large, more than 20,000 parts, you can anticipate random defects for a process of CpK just meeting 1.33. The difference between your company’s quality processing goal of a CpK of 1.33 or a CpK of 1.5 (Six Sigma) is only an additional 60 defects. This equates to a maximum defect rate of 63 ppm while others say a maximum of 3.4 ppm is the true capability process meaning of Six Sigma control. What is a capable process? Some quality assurance experts define a capable process as one having and maintaining a CpK index of at least 1.33. Joseph Gordon Jr., in Six Sigma Quality for Business and Manufacture, 2002 PROCESS-CAPABILITYīefore determining if your company and all your processes need to be in Six Sigma Process Capability it is important to discuss what you can get for your efforts and evaluating your processes for how you get them to Six Sigma.
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