While the Five Why process does narrow your focus in an attempt to find the root cause of a problem, I can't help but wonder if it works for all issues. I highly doubt that every time you ask five whys, you will happen upon the root cause. I think that it depends on the problem and what type of why questions are being asked. Many problems may require 7 whys to get to the root, while others may only requirse 3, so why does Toyota say 5 is the key?
I think that setting it at five can make people think they are at the root cause when perhaps they need 8 Whys to truely discover the cause. In addition, the five why process will produce different results from every person because everyone does not ask the same why questions.
While good in theory, I think this process has too many flaws for someone to depend on when trying to solve a problem.
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