CNX-SOP analysis - PF/CE/CNX/SOP 英文版，

PF/CE/CNX/SOP: A methodology
that is used to reduce extraneous variation. It uses process flow diagrams (PF)
and cause and effect diagrams (CE) to identify and sort the causes of
variation. The causes are further categorized as controllable (can be held
constant “C”), noise (too difficult or expensive to control “N”) or
experimental (factors
which must be investigated to understand their impact “X”). Standard
operating procedures (SOP) are used to establish methods for holding the “C”
factors constant.

http://www.airacad.com/WhatIsDefinitions.aspx



Most of the valid results were about "lean six sigma" and root cause
investigations.

 

PF/CE/CNX/SOP is part of
the 6 Sigma tool set as an analysis tool. The general process is:



PF = Process Flow

–Map or flowchart the process

–Identifies sources of waste, decision points, and loops

–Identifies flow of materials and information



CE = Cause & Effect

–Brainstorm potential sources of variation

–Promotes out of the box thinking and employee involvement



CNX = Constant, Noise, and Experimental

–Classify all sources of variation

–Constant factors can be controlled

–Noise factors cannot be controlled or are chosen not to be held constant

–Experimental factors can be tested at different options or settings



SOP = Standard Operating Procedure

–For all C’s or Constants on the Cause & Effect

–Explain how to hold the factors constant 

 

CNX is extremely
familiar in the context of statistical process control.



The Constant factor of CNX is the same as special causes of variation in SPC.
The Noise factor of CNX is the same as common causes of variation in SPC.



You shouldn't have to look too far to find examples of the Experimental factor
of CNX.



I highly recommend reading some overview of statistical process control
materials. This will elucidate further what you may already know about
statistics and reducing variation in the scope of six sigma improvement
projects.



http://www.statit.com/statitcustomqc...C_Overview.pdf



http://www.skymark.com/resources/too...rol_charts.asp

 

http://elsmar.com/Forums/showthread.php?t=16864

					

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2016-08-25 18:14:51