The boundary

The boundary is the moment a request leaves one person's ownership and enters another's.

This is the handoff point — where a physician asks a nurse, where a nurse hands to a scheduler, where a consult goes to an outside department. It is where clinical work is most likely to be lost, because ownership is ambiguous for a moment and neither side is sure the other has accepted.

Semblance makes the boundary explicit: every request has a named owner, and acceptance is confirmed, not assumed.