It is sometimes not necessary to determine new control limits after special cause variation has been identified if the source has been eliminated without changing the process.

Question

Quizplus · Accepted Answer

If the source of the special cause variation has been removed and the process is back to its stable state, there is no need to recalculate the control limits as they are based on the stable process performance. However, if the source is not eliminated or if the process is changed, it is necessary to recalculate the control limits to reflect the new process performance.

It Is Sometimes Not Necessary to Determine New Control Limits