Page 66 - Yellow Belt Six Sigma II

5 Whys

The 5 Whys is a problem- Here's an example of how the 5 Whys could be used in Six Sigma:

solving technique used in Problem: A manufacturing company has experienced an increase

Six Sigma that involves in customer complaints about product defects.

asking "why" multiple

times to uncover the root 1.Why are customers complaining about product defects?

cause of a problem. The Because the products are not meeting their expectations.
2.Why are the products not meeting their expectations? Because
technique involves asking the products are not meeting the required specifications.

a series of five "whys" 3.Why are the products not meeting the required specifications?

questions to get to the Because the manufacturing process is not consistent.

underlying cause of the 4.Why is the manufacturing process not consistent? Because the

problem. machinery is not calibrated properly.

5.Why is the machinery not calibrated properly? Because the

maintenance schedule is not being followed consistently.