At the end of the shift, Louise collects all active and non-active telephone numbers from
interviewers and sorts them into categories so that they are ready for the next interviewing shift.
Call backs are organized in descending order of priority by the time they are scheduled to be
called back; e.g., telephone numbers that should be called back at 5:30 are on top of those that
should be called back at 7:30, and a scheduled callback to complete a survey at 5:30 is on top of a
routine callback for 5:30