The principal focus of the control chart is the attempt to separate special or assignable causes of variation from common causes of variation. What cause of variation can be reduced only by changing the system?
A) special or assignable causes
B) common causes
C) total causes
D) None of the above.

Question

Quizplus · Accepted Answer

Common causes of variation cannot be completely eliminated, but can only be reduced by changing the system. Special or assignable causes of variation are caused by individual events or occurrences, which can be identified and eliminated, while common causes of variation are inherent in the system and require systemic changes to minimize their impact. Total causes include both common and special causes of variation.

The Principal Focus of the Control Chart Is the Attempt