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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:

 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. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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