look.thing is simple and straight forward. first two copies of quotations are dropped at commanders' office, one with commission highlighted and second without it.
then detailed analysis of commission is done so that they know how much each of the corrupt will get, then selected companies will respond, for detailing the installments and downpayment and all.
finally in the trails, a sample amount is sent thru safe network. if no one detected it. bingo contract is signed, if not then deal is cancelled and re-tendering with foolish company debarred.
simple