Note added after HN editing hour closed: The reason I created these Procedure Cards is that when I was really tired — for example at 1 a.m. after I'd been on call and working 18 hours since 7 a.m. the previous day, with six more hours to go till I was relieved at 7 a.m. — I invariably forgot something I needed and had to wait or make do because of this fatigue-induced lapse. With my list, I was able to do what I knew how to do without having to try and remember a zillion specific things.