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Well to put it simplistically, the value that is given to a customer (called a PCV*) for ranking can apply to any way in which QF wants to use it. In the system, there's a feature called 'Proactive Onload' that calculates the pax booked vs estimated to check in and board. From that screen, the system makes recommendations of which pax are to be oped-up. Now, keyword is RECOMMENDATIONS, the staff and supervisor make the ultimate decision but in essence the system is designed to choose who gets Oped-Up and who stays put.
PCV*: ... Basically, Qantas has setup a list order (call it a value) of each pax for each and every flight ... . The ranking order takes into account FF status, PNR associations, SSRs, booking class, etc. ...