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:: Home ::Six Sigma ::SIX SIGMA GLOSSARY: Pre-Control :: CURRENT STUDENTS LOGIN

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Pre-Control
 

Pre-control is an alternative to control charting. A chart is prepared with the span between the specification limits (not the control limits) divided into colored bands:

Individual items are taken from the process, measured and plotted on the charts. The initial process adjustment, and subsequent patterns are based on the pattern of points:

Initial Adjustment (Qualification):

5 parts in a row are in the green OK to run
1 part in the yellow restart the count
two consecutive parts in the yellow  
one part in the red adjust the process and restart the count

Operation:

take 2 consecutive parts from the process  
first part checked is green continue operation
first part checked yellow check the second part
second part green continue operation
second part yellow or either part red stop and adjust the process
 

The selection, design and use of control charts is covered in the MiC Quality courses Statistical Process Control and Advanced Statistical Process Control.

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