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This is wrong the performance index P is the reciprocal of the process capacity Index Cp. So all this stuff refers to the Cp index not the P index. — Preceding unsigned comment added by 220.127.116.11 (talk) 06:35, 13 April 2012 (UTC)
That's right. I quickly changed P to 1/P, but the article needs a rewrite. — Preceding unsigned comment added by 18.104.22.168 (talk) 11:20, 14 August 2012 (UTC)
That's funny. Your definition doesn't match that given in the citations or any of the top search results (e.g., , , , , etc.). Could it be that you're pulling a prank? After all, 99% of readers won't question a nonsense edit if it looks authoritative enough! -- DanielPenfield (talk) 00:27, 15 August 2012 (UTC)