I don't know much about "lean" as a unique methodology. Exactly how is "lean" new and unique? Or is it just mostly the same old (but reliable) tools repackaged into a "new" methodology with a new name (buzzword) to give consultants and authors something new to talk and write about? Is it just a new management/quality "fad"? I'm skeptical. I've seen several programs come and go, all of which had the anecdotal "real-world examples of dramatic improvements at Company X", but most had little really new content. Yet management groups everywhere picked up the programs as the latest-and-greatest -- 'till the next thing came along and they jumped at that.
Call me jaded, but IMO if the Management group is truly dedicated to improvement and they are open to change and have common sense, they can succed and make the company succeed with just about any "program" or "methodology" -- or pieces of several different ones. If the Management group is NOT truly dedicated to improvement, open to change, and have common sense there is no program or methodology int he world that will help them, be it Lean, Re-Engineering, Six-Sigma, TQM, DOE, SPC, Quality Circles, or anything else. I think that in most companies that the specific tools (program) selected may make a 10% difference in results, the other 90% is related to dedication, openness to change, and some good old applied common-sense. Kinda like a pro-baseball player using one brand of shoes or bats or gloves vs. another vs. another -- at the end of the season I'd bet the equipment would have little to do with how well he did (assuming that none of the equipment was grossly ill-suited). JMHO.