Admin
From filing receipts to getting train tickets
Admin is the connective tissue of daily operations, and when it is undocumented it becomes a bottleneck concentrated in whoever has always done it.
Every organization has a layer of recurring tasks that keep things running: booking travel, filing receipts, renewing subscriptions, handling mail, ordering supplies. None of it is glamorous, but when the person who knows how to do it is away or gone, everything slows down.
The goal is not to turn admin into a manual. It is to make sure the steps that matter are written down clearly enough that someone else can follow them without having to ask. That means knowing which tasks recur, on what schedule, and who currently owns them.
Admin documentation ages quickly, so it needs a simple maintenance habit: review it when something changes, not once a year when everything is stale.