Abstract: A software client can be used to prepare a complex request for proposal (RFP) that can include multiple bidding tiers, composite items and that can be fulfilled with non-conforming bids. The RFP is distributed to a number of bidders who submit bid quotes or alternative items. The amount of details disclosed to other bidders regarding the bids is selectable by the user. Revised bids are accepted for a predetermined time period, or until a threshold condition is reached, at which time the bids are compared and assessed to determine a winning bid. Once a winning bid is determined and a contract awarded, payment and settlement of the terms of the RFP can be monitored and tracked. A central computerized system, such as a web site, provides the data collection, data storage, data manipulation, connectivity functions, and messaging protocols used by the participants in the RFP marketing process.