This not so famous quote from Henry Ford illustrates why manufacturing operational proven methods don't work very well in a hospital. For the past 15 years I've been watching hospitals struggle with improvement methodologies like Lean and Six Sigma and their application to ED wait times, medication administration, OR TAT, and even sepsis.
The weak results are not for lack of investment, training, or time. The reason why these approaches seem to fail us is that we are forcing change. It's always boiled down to a change management problem: "they are resistant to change". After decades of trying we are just not getting the results from what I call manufacturing oriented operational improvement methodologies. And the reason is simply that a hospital is not a factory.