We’ve all seen them, and most of us make them. Process lists, to-do lists, lists of all kinds–there’s something very satisfying about checking a little box or crossing an item off a list. However, checklists can serve a greater purpose than as a physical reminder that we’ve accomplished something. In many fields, checklists exist because human brains are fallable and prone to distraction. Pilots use checklists to make sure that amid dozens of relatively simple tasks, none get forgotten. Checklists used before and during surgery reduced the death rate by nearly 50%.