End the practice of awarding business on the basis of price tag. Instead, minimize total cost. Move towards a single supplier for any one item, on a long-term relationship of loyalty and trust.Demming
Cp tells you if your process is capable, Cpk tell you how centered you are. Most requirements are for Cpk as it is an indication of how much good product you are producing. A great Cp (capable process) is worthless if you are producing outside of the spec limits. A perfectly centered process will have Cp=Cpk.
If your mean is trending, then the process in not in control and the Cp and Cpk will be of little value. You need to figure out why the process is trending and bring it under tighter control.My $0.02
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