Quick answer
RFI gathers info (who are you?), RFP gathers proposals (how would you solve it?), RFQ gathers prices (how much for this spec?) — the three procurement documents in sequence.
RFI
Request for Information — early market research: who can do this and how — before requirements are firm.
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RFP
Request for Proposal — the main event: problem stated, vendors propose solutions + price — for complex buys.
RFQ
Request for Quotation — spec is fixed, you want the price — for known commodities.
The sequence
RFI (explore) → RFP (propose) → RFQ or contract (price) — each answers a different question.
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FAQ
Bottom line
RFI gathers info (who are you?), RFP gathers proposals (how would you solve it?), RFQ gathers prices (how much for this spec?) — the three procurement documents in sequence.
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