An open Request for Information (RFI) is a way for buyers to gather information about prospective suppliers and the items they can provide. Buyers often use the information gathered by an RFI as input for designing a future sourcing activity, as an initial stage of a multistage RFX activity. Valuable information for a buyer could include the number of sellers interested, specific seller identities, and how well sellers match or might change details about the items being sought (as specified by term values accompanying their responses).
Most RFIs are typically designed as a questionnaire for suppliers to complete (at the RFX Info page when preparing their response). Often, specific items are not identified in the RFI, or if they are, the buyer wants suppliers to select only items they are interested in, without entering prices, quantities, or any other specific item terms. If multiple line items are sought in the RFI, a supplier's response must include all items.
A buyer initiates the RFI, seeking responses from potential suppliers. A supplier's bid in an RFI is called a response, but the process of submitting a response is the same as placing a bid in most other RFX activities because it uses the bid process to help the supplier.
The Request for Quote (RFQ) and Request for Bid (RFB) are similar RFX types, operating in much the same way. The main difference is the action in the two types is switched, reversing the roles of the owner and participants:
RFQ is a buy-side RFX type. The owner is a buyer, and participants are potential suppliers.
RFB is a sell-side RFX type. The owner is a seller, and participants are potential customers.
A Request for Proposals (RFP) is an RFX type designed to collect information in the form of responses from suppliers. Proposal collection is typically a sealed process, where participants know very little if anything about other participants and the proposals they submit.
Like RFIs, RFPs often include an RFX Info section describing the buyer's specific business scenario and the needs the buyer wants to solve. This RFX Info section typically also contains a questionnaire, sometimes very extensive, which the buyer uses to determine the capabilities and flexibility of potential suppliers.