When Huckman and Pisano examined the data, they discovered a remarkable pattern. Overall, the surgeons didn’t get better with practice. They only got better at the specific hospital where they practiced. For every procedure they handled at a given hospital, the risk of patient mortality dropped by 1 percent. But the risk of mortality stayed the same at other hospitals. The surgeons couldn’t take their performance with them. They weren’t getting better at performing coronary artery bypass grafts. They were becoming more familiar with particular nurses and anesthesiologists, learning about their
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