SpaceX and NASA countdowns aren’t quite checklists in the same sense of the surgeon’s or pilot’s checklist. Those countdowns are verifying that a bunch of laun

SpaceX and NASA countdowns aren’t quite checklists in the same sense of the surgeon’s or pilot’s checklist. Those countdowns are verifying that a bunch of launch blocking gates have not been closed. The key difference is that it’s not a reminder for people of stuff that needs to be done. It’s more like a roll call to make sure they have a unanimous vote to go from all teams that have a stake.