AAOM Handbook

INTERNAL

If the change in the process is going to be sustained then calculate new temporary control limits as each new point is added (using all of the points occurring after the change is established) until you have at least 25 points in the calculation. Extend these control limits as each new data point is added to the chart. At this point you can use the control chart for ongoing monitoring of the process.

© McAlear Management Consultants 2007

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