Anna,

I think you're asking for a definition of the nomenclature rather than a
definition of the statistic.  If that's the case, searching through many
books has come up with the following:

Cp-Capability, Process or Potential
Cpl-Capability, Process, Lower (to LSL)
Cpu-Capability, Process, Upper (to USL)
Cpk-Capability, Process, with K-Index
Cpm-Capability, Process, Midpoint?

There are some statements around the definition of "K" and "M".

"K" being a measure of the difference between the process mean and the
specification target.  This still doesn't explain how the letter "K"
represents this.

"M" to show variation calculated around a target value rather than the
average (Taguchi index).  I'm guessing that it stands for Midpoint but
could not find any reference for it.

Well, I'm certainly no expert.  But, if it helps you remember them, then
that's what matters.

Glenn


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