Dave Gleditsch, Chief Technology Officer, Pelion Systems, makes many excellent points in: Transforming Your Business To Lean: Lessons Learned [the broken link was removed]:
Often measures become the focus and the reason for improvement is obscured. Improvement should eliminate waste and improve value to the customer. Measures should help determine the success along that path but improving the numbers is not the aim, the numbers are merely proxies for that aim.
Successful management improvement is not about mindlessly applying quality/lean tools. The tools and concepts are very helpful but then people must make judgements about what is needed, what to emphasis, where to focus, how to proceed given the current organization…