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Subject:	Re: Cpk Question
From:	"Edwards, Ted A (AZ75)" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 24 Feb 1999 15:52:24 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (47 lines)

A good place to look for this kind of information is ANSI/IPC-PC-90 General
Requirements for Implementation of Statistical Process Control which is
available from the IPC.  Page 5 defines Cpk as equal to the min of CPL,CPU
where CPL is process performance related to lower specification limit and
CPU is process performance related to upper specification limit.
I have seen this also defined as a ratio that compares the width of the
tolerance to the capability or spread in the output of the process taking
into account any lack of centering..

> -----Original Message-----
> From: Anna Miracle [SMTP:[log in to unmask]]
> Sent: Wednesday, February 24, 1999 1:14 PM
> To:   [log in to unmask]
> Subject:      [TN] Cpk Question
>
> Ancillary subject, but I know somebody out there can enlighten me. Does
> anyone
> know what cpk means besides "process capability index"? Does "cpk"
> actually
> stand for something?
>
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