There's another approach that goes underappreciated, I think -- the "model line" or "model cell" approach. It has nothing to do with fashion models. I don't like the term "cell" because it might make people think of a prison or a gulag. Then again, the word "line" might make people think of "assembly line medicine" in a negative way. Maybe "model area" is a better term? I'll think about that as I work on the updated 3rd edition of my book Lean Hospitals.