I have a buddy who went through six-sigma and Toyota Production System training in his work as a Process Engineer in a large manufacturing company. When we talked about the application of methodology to an organization, he made a keen observation on human nature: "people don't like to be told what to do." To me, this goes a long way toward explaining why "conceptual integrity" matters more than a methodology, and why it is difficult to apply a methodology to a new team or company unless they discover it for themselves organically.