Handoff is the work of making what matters portable enough for the next person, next session, or next system to continue without rebuilding the whole picture from fragments.
That means not only passing a note or a file, but preserving enough of the actual operating logic: what changed, what decision was made, what remains open, what the constraints are, and what should happen next.
In Fragment Practice, handoff is not treated as a minor clerical task. It is a continuity structure. When it is weak, teams spend their energy reconstructing context instead of moving forward from it.