Half heard a piece on the BBC Radio 4 Today programme this morning about this, and think it was about this:
a new WHO checklist to ensure that all necessary things are carried out before and during an operation. It identifies three phases of an operation - "sign in" (before anaesthesia is induced), "time out" (before any incision is made), "sign out" (before patient leaves the operating room). There are certain tasks to be performed in each phase - for example, in sign in, checking that the correct site is marked, and in sign out, counting the swabs.
This information is from the WHO Press Release (link above), I have not found the list itself.