DETROIT - Last summer Detroit school officials issued requests for proposals (RFPs) to private food vendors to take over the district's food services. The RFPs asked vendors what it would cost the district to provide cafeteria services for students in the Detroit school system. Robert I. Brown, the district's executive director of special projects, division of business operations, informed MPR that, after reviewing the proposals, district officials became convinced that "a fixed price contract was not the way to go." The district intends to re-bid the service. It is expected to issue a new RFP by the middle to the end of November.