Question

R2.9: Suppose you have completed an Ishikawa diagram. Which is the best way to search for true root causes out of all the possible causes identified?

A. Only look at the deepest level on the fishbone.

B. Investigate the Xs on the major bones. The root cause will be at that level.

C. Gather data to confirm/deny each identified possible cause on your fishbone.

D. Use a multi-vote process to select highly likely root causes and then use force-field analysis on them. Gather data to confirm that the selected Xs affect the Ys of concern. If none of the investigated Xs turn out to significantly affect the Ys, then return to the fishbone and start over.

Answer 1

The best way to search for true root causes out of al the possible causes identified is to use a multi-vote process to select highly likely root causes and then use force-field analysis on them. Gather data to confirm that the selected Xs affect the Ys of concern. If none of the investigated Xs turn out to significantly affect the Ys, then return to the fishbone and start over.