He designed a preincision “Cleared for Takeoff” checklist that he put on a whiteboard in each of the operating rooms. It was really simple. There was a check box for the nurse to verbally confirm with the team that they had the correct patient and the correct side of the body planned for surgery—something teams are supposed to verify in any case. And there was a further check box to confirm that the antibiotics were given (or else judged unnecessary, which they can be for some operations).