This is the join that makes the rest of the Call Center numbers mean something. It puts the plan
next to what really happened, so a bad hour has an answer:
understaffed means you did not
roster enough,
staffed but missed target means the people were there and something else went
wrong.
On a queue matters - somebody rostered who is not a member of any queue cannot be sent
a call, however good the roster looks. Detail for the same calls is on
Reports.