The Surgical Safety Checklist: simple, cheap and reduces mortality by 75%. What's not to like?
...except that when you ask everyone to use it, nothing happens: no reduction in mortality, no reduction in complications, no reduction in re-admissions. Bummer! I've never read a paper with so many 'no's.
So the simple, cheap, effective checklist turns out to be effective only if people actually use it. And the it turns out to be neither simple nor cheap because of all the face-to-face time needed to persuade people to use it.
The authors point out that one of the advantages of their method, which uses routine data, is that it encompasses everyone, not just the enthusiasts.