RFI, RFP, and RFQ are three distinct procurement documents used at different stages of finding and selecting a supplier. Each requests different information and is appropriate at a different point in the sourcing process, and using the wrong one, particularly asking for detailed pricing before the requirements are even settled, is a common source of wasted effort on both sides.
An RFI is used early in the sourcing process, when a buyer wants to understand what suppliers and solutions exist in a market before defining detailed requirements. It typically asks about a supplier's capabilities, experience, and general approach, not specific pricing.
An RFI is exploratory. It helps a buyer narrow a broad field of potential suppliers down to a shortlist worth engaging more formally, and it is often skipped entirely for straightforward or well-understood purchases where the buyer already knows the market.
An RFP is used when a buyer has a defined need but wants suppliers to propose their own approach to solving it, not just a price. It typically requests a detailed solution, methodology, relevant experience, timeline, and pricing together, and is evaluated on the overall quality of the proposed approach, not price alone.
RFPs are most appropriate for complex purchases, like a software implementation, a construction project, or a service engagement, where how a supplier would do the work is a genuine differentiator worth evaluating, not just how much they would charge.
An RFQ is used when the specification is already well-defined, and the buyer primarily wants to compare pricing across suppliers who can all meet the same clearly stated requirement. It typically asks for a price and delivery timeline against a fixed specification, not a proposed approach.
RFQs are most appropriate for standardized purchases, like a defined quantity of a specific raw material or component, where the product or service itself does not vary meaningfully between suppliers and price is the primary differentiator.
These stages can flow into each other on a single sourcing effort: an RFI narrows the field, an RFP is sent to the resulting shortlist, and once a solution approach is selected, a final RFQ might be used to negotiate pricing on defined, agreed specifications.
Once a supplier is selected through this process, the terms established, whether through an RFP's proposed pricing or an RFQ's quoted price, become the reference point for the purchase order and every invoice matched against it going forward. A pricing discrepancy that shows up during invoice matching months later frequently traces back to a term that was agreed during sourcing but never carried forward accurately into the purchase order or the vendor's business rules.
