This Tool is very good if you have the right people to execute. There are many advantages and one major one is that is help seperate symptom from root cause by using the deep process. It is also allows for your similar processes to gain the same benefit from the wide process.
Chrysler is trying to roll it out as well, they call it the three legged 5 why process.
you can get more information on gmsupplypower.com after you log in go to the library and look the forms up.