The short answer
The three documents differ in how much the buyer already knows about what it needs, and in what it wants back from suppliers.
- RFI: the buyer is still learning and asks suppliers for general information about what they offer.
- RFP: the buyer knows the problem and asks suppliers to propose a solution, a plan and a price.
- RFQ: the buyer knows exactly what it needs and asks suppliers to quote a price for it.
What is an RFI (request for information)?
A request for information (RFI) is an early, exploratory document. Its purpose is to help a buyer understand a market: which suppliers exist, what they offer, how their products or services generally work and what they would need from the buyer to deliver. An RFI is usually not a commitment to buy, and it rarely asks for firm pricing.
Use an RFI when the requirements are not settled yet, when the buyer is new to a category, or when it wants to build a shortlist before starting a formal process. It is also a low-effort way to check whether a project is realistic before anyone spends time writing a full RFP. In the RFI vs RFP choice, the deciding question is whether the buyer knows enough to describe the problem in detail.
What the buyer gets back is broad background: company overviews, descriptions of products or services, general capabilities and sometimes rough cost ranges. That information shapes the requirements for the next stage and decides which suppliers are invited to it.
What is an RFP (request for proposal)?
A request for proposal (RFP) asks suppliers to explain how they would solve a specific problem or deliver a specific project. The buyer describes its goals, scope, requirements, timeline and evaluation criteria, then invites suppliers to respond with their proposed approach. Because there is often more than one good way to meet the need, an RFP leaves room for suppliers to show their thinking.
Use an RFP when the need is complex, when price alone should not decide the outcome, or when the buyer wants to weigh experience, method, quality and support alongside cost. Professional services, software, consulting and other projects with many moving parts are common examples.
What the buyer gets back is a detailed proposal from each supplier, typically covering the solution, the plan for delivering it, the team, relevant experience, terms and pricing. The buyer scores the proposals against its criteria and often follows up with presentations, clarifying questions or negotiation before it selects a supplier.
What is an RFQ (request for quotation)?
A request for quotation (RFQ), also called a request for quote, asks suppliers to price a need that is already clearly defined. The buyer states exactly what it wants, such as the products, quantities, specifications and delivery terms, and suppliers reply with what they would charge to meet them.
Use an RFQ when the requirements are fixed and the options are largely interchangeable, so the main open question is cost. Standard goods, materials, parts and well-defined services are typical cases, as is a final pricing round after an RFP has narrowed the field. In the RFP vs RFQ choice, the deciding question is whether price alone should pick the winner.
What the buyer gets back is a set of quotes that are easy to compare line by line: unit prices, totals, delivery times and payment terms. The award often goes to the lowest price that fully meets the specification, although reliability and terms can still tip the decision.
How the three fit together in one buying process
Not every purchase uses all three documents. When a buyer does use them together, they usually run in sequence, with each step narrowing the list of suppliers and sharpening the requirements.
- Start with an RFI to learn what the market offers and build a shortlist of suppliers.
- Use what the RFI responses reveal to write clear, realistic requirements.
- Send an RFP to the shortlist to compare proposed solutions, approaches and overall value.
- Finish with an RFQ, if needed, to get final, comparable prices once the solution and scope are fixed.
- Skip straight to an RFQ for simple, well-defined purchases where price is the only real difference.
- Skip the RFI when the buyer already knows the market and the likely suppliers well.
RFP vs RFI vs RFQ: how they compare
The easiest way to tell the documents apart is to compare what each one is for, how much detail it carries and how much weight it puts on price.
A simple test also helps. If you cannot yet describe what you want, start with an RFI. If you can describe the problem but not the best solution, use an RFP. If you can describe exactly what you want, use an RFQ.
- Purpose: an RFI gathers information, an RFP compares solutions and an RFQ compares prices.
- Buyer knowledge: limited for an RFI, solid for an RFP and complete for an RFQ.
- Level of detail: an RFI asks broad questions, an RFP sets out detailed requirements and an RFQ lists exact specifications.
- Price focus: an RFI rarely asks for firm prices, an RFP weighs price against other factors and an RFQ is mostly about price.
- Response effort: RFIs and RFQs are usually quicker to answer, while an RFP often takes the most work.
- Outcome: an RFI usually produces a shortlist, while an RFP or RFQ usually ends with a supplier being selected.
Where due diligence questionnaires (DDQs) fit
A due diligence questionnaire (DDQ) is a structured set of questions that a buyer, investor or partner uses to assess an organization before working with it. Instead of asking what a supplier would deliver or charge, a DDQ asks about the organization itself: how it is run and governed, how it manages risk, security and compliance, how stable its finances are and which policies it has in place.
DDQs often travel alongside RFIs and RFPs. A buyer may attach one to an RFP, send one to the shortlisted suppliers, or require one before a contract is signed. They are especially common in financial services and in any purchase where the buyer needs confidence in how a supplier operates. Many of the same questions come up from one DDQ to the next, so suppliers that keep their answers current and well organized can respond faster and more consistently.
How XiCLOPS helps you answer them
XiCLOPS uses your own documents to fill out RFPs, RFIs and due diligence questionnaires, not price quotes.
It works with Word, Excel, PowerPoint and PDF files. You can see the source documents behind each answer, and yellow highlights flag details your files do not cover. When the work is done, your questionnaire comes back in its original format.
You can try one run free, with no card required.