Quality Management 2017

A NALYZE

Control charts: Calculation of control limits

S TEP 6 ( NEXT ): I NTERPRETATION OF THE CONTROL CHARTS

• Verify that the process is stable over time in position and in dispersion (no change, no adjustment during this period).   special causes in the data used to calculate the limits . • Do you detect points out of the limits? Are they outliers? Are they due to the  risk ?  Decide if you prefer removing them to recalculate narrower limits  better quality. • Set your limits. They will be used to monitor next results (samples 11 to 30) and to detect any potential special cause.

03/10/17

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