Toyota’s Win That Wasn’t, an interview with, Matthew E. May, author of The Elegant Solution: Toyota’s Formula for Mastering Innovation:
This illustrates an important point in how the PDSA improvement cycle should be used: results are studied to increase knowledge. If results exceed expectations that should not be a reason to avoid learning. If you only study what results tell you when results are unsatisfactory you can fall into the trap that “you only learn from failure.” I guess many people only learn from failure, since that phrase is so popular, but that method leaves plenty of room for others to learn faster than you thus gaining an advantage (a more effective method of learning). Don’t wait to fail to learn.