There’s a scene in the movie Bill and Ted’s Excellent Adventure where they lament that they need some keys that were lost two days earlier. But because they have a time machine, they can just wait until later, go back in time before they’re lost, and leave them right next to where they are “now” for convenience.
It’s funny, of course. But also, kind of … smart. It shows that if you can count on someone doing something in the future, you can make current plans based on that knowledge. The trick is, each of us has to know what the other is planning.
Bill and Ted can rely on a future (and past) version of themselves to complete their plans. Library staff have to rely on shared data and common, agreed-upon signals across our collective collection.