The complete bid or proposal must be submitted to the Department of Procurement Services before the date and time specified. All vendors submitting bids and offers on Illinois public contracts must: 1.Be a legal entity authorized to transact business or conduct affairs in Illinois. (a) All bidders on construction contracts shall complete and submit, along with and as part of their bids, a Bidder's. A Request for Proposal (RFP) is the appropriate competitive selection process for purchasing goods or services when price is not the most important criteria. I'll be leading this workshop on how to respond to a request for proposal or rfp.