First Proposal In First Proposal Out in Schedules, GWACS, MACs, IDIQs Posted Wednesday at 02:51 PM · Report reply The only way I as a contractor would find this approach palatable would be if parties that bid on the first tranche were then excluded from bidding on subsequent tranches, and that parties that bid on the second tranche would be exluded from subsequent tranches, etc. The exclusion would apply regardless of whether the offeror received a contract. Otherwise, you are just offering multiple -- and expensive! -- bites at the same apple. It's a reverse pyramid scheme where the earliest bidders get the most work and the later bidders will get less work (based on an assumption regarding periods of performance) ... but the latter bidders will have to pay the same proposal preparation costs as the early bidders. Moreover, if you give offerors multiple bites at the same apple, the later bidders will have spent two or three or four times the proposal prep costs as the early offerors, and received less for it. Also, if you give bidders multiple bites you create an opportunity for them to use information from the early bids to upgrade their later bids ... which could be (potentially) an OCI issue. If you need more contractors (as opposed to bigger contracts) then I think you are better off making all the awards at one time. Again, a contractor's perspective, FWIW.