One technique for managing paperwork that's fairly common in productivity circles is the Noguchi filing system, in which files are always re-filed on the left of a shelf. This results in a gradient of freshness, with old or stale files naturally sorting themselves to the right, whence they can be discarded or permanently archived.
It's a nice system, but the archiving/discarding triage takes such effort doesn't it? Once those files have made their way to the back or the bottom of the filing cabinet, wouldn't it be nice if your filing system automatically and judiciously took care of that for you.

Comments