We all know what an OR schedule gone haywire is like. As the waits grow longer, the fuses of surgeons, staff and patients grow shorter. But here's a question you might be overlooking: Are you monitoring tardiness accurately? You're not if you're tabulating the number of cases that start late, instead of the average number of minutes all cases start late. Seems like we're splitting hairs, but as you'll see, there's a big difference between cases and minutes.