RFP vs RFQ vs EOI: what’s the difference?

Procurement uses a family of notice types, and responding to one as if it were another is a quick way to lose. Here’s what each means and when buyers use it.

EOI — Expression of Interest

An EOI (sometimes REOI) is an early-stage call used to gauge the market and shortlist capable suppliers before a full tender. You usually submit qualifications and experience, not a firm price. Think of it as pre-qualification: get onto the shortlist, and you’re invited to the detailed bid.

RFQ — Request for Quotation

An RFQ is used when the requirement is well defined and standard — off-the-shelf goods or simple services — and the main variable is price. Specifications are fixed, so you mainly quote rates. Award typically goes to the lowest compliant quote (L1).

RFP — Request for Proposal

An RFP is used when the buyer knows the problem but wants suppliers to propose the solution — consultancy, system implementation, design. You submit both a technical proposal (approach, methodology, team) and a financial proposal. Award weighs quality and cost, often via QCBS rather than lowest price alone.

ITB / RFB — Invitation to Bid / Request for Bids

An ITB or RFB is the classic tender for works and defined goods where specifications are clear. Compliant bids compete largely on price. Multilateral lenders such as the World Bank use “Request for Bids” for goods and works, and “Request for Expressions of Interest” for consulting shortlists.

Quick comparison

Why it matters

The notice type tells you what evaluators will reward. For an RFQ, sharpen your price. For an RFP, invest in methodology and team. For an EOI, focus on demonstrable, relevant track record — price comes later. Match your effort to the stage and you’ll waste far less of it.