what’s really interesting is what happened to the surgeons who saw their colleagues fail at the new CABG procedure. These showed significant increases in their own success rates with every failure that they saw another doctor experience. Further perplexing, however: seeing a colleague perform a successful surgery didn’t seem to translate to one’s own future success. It was indeed a paradox. Screwups got worse. When colleagues screwed up, observers got better. When a doctor succeeded, she did better on her subsequent surgeries. When her colleagues did well, it didn’t affect her.

