DDQ vs RFP:what is the difference?
A DDQ and an RFP are both structured documents full of questions, which is why they get confused, but they answer different questions for the sender. A DDQ (due-diligence questionnaire) is about trust: is this organisation safe to work with? An RFP (request for proposal) is about selection: which product should we buy? The overlap is real, and one good answer library can serve both.
DDQ and RFP in one sentence each
- A DDQ evaluates an organisation's risk and trustworthiness before a deal, investment, partnership, or supplier relationship.
- An RFP asks vendors to propose how their product or service would meet a defined set of requirements, usually with pricing and terms.
Put simply, a DDQ asks "should we trust you?" and an RFP asks "are you the right one to buy?" A buyer often runs both: an RFP to choose a vendor, then a DDQ (or its security section) to clear that vendor through risk and procurement.
Who sends each, and when
The sender and the timing are the clearest way to tell them apart.
- DDQ: sent by investors, procurement teams, and partners during due diligence, onboarding, or a periodic vendor review. The goal is to document risk before committing.
- RFP: sent by a buyer who has a defined need and wants to compare vendors on capability, approach, and price before purchasing.
Where RFI and RFQ fit
RFP, RFI, and RFQ are a family, often called RFx. They sit at different points in a purchase.
- RFI (request for information): an early, exploratory request to learn what options exist before the buyer knows exactly what they want.
- RFP (request for proposal): the main event, asking vendors to propose a solution against defined requirements.
- RFQ (request for quotation): a price-focused request when the scope is already well defined.
A single purchase can use more than one in sequence: an RFI to shortlist, an RFP to choose, and a DDQ to clear the winner through risk.
Where the security questionnaire fits
A security questionnaire is the most focused of the lot. It is not a whole process; it is a slice about how you protect data, and it frequently appears as a section inside a DDQ or an RFP, or as a standalone follow-up such as a SIG or CAIQ. So a security questionnaire is usually a part of the larger document, not an alternative to it.
How much they overlap
The reason these blur together is that the underlying questions repeat. Questions about your security controls, data handling, certifications, business continuity, and company background show up in DDQs, in the security sections of RFPs, and in standalone security questionnaires alike. The wording changes; the substance does not. That repetition is exactly why a maintained answer library pays off: write and approve the answer once, then reuse it wherever the same question reappears.
One answer library for all of them
Because the content overlaps, you do not need a separate process per document type. Keep your approved answers and source evidence in one knowledge base, mapped to the common frameworks, and you can draft a DDQ response, an RFP security section, and a standalone questionnaire from the same vetted material. The work shifts from writing from scratch to matching, tailoring, and verifying, which is where tools that draft from your own sources and check each answer before it goes out save the most time.
Frequently asked questions
Is a DDQ the same as an RFP?
No. A DDQ (due-diligence questionnaire) assesses whether an organisation is safe and trustworthy to work with, covering finances, operations, security, and compliance. An RFP (request for proposal) asks vendors to propose how their product meets a buyer's requirements so the buyer can choose what to purchase. They overlap in content but serve different decisions.
Can a security questionnaire be part of a DDQ or an RFP?
Yes. A security questionnaire is often a section within a larger DDQ or RFP, focused specifically on how you protect data. It can also arrive on its own as a standard template such as SIG or CAIQ, or as a follow-up after the main document.
Do I need different tools for DDQs and RFPs?
Usually not. Because the questions repeat across DDQs, RFPs, and security questionnaires, one maintained answer library can feed all of them. The efficient approach is a single knowledge base of approved, source-backed answers that you reuse and tailor, rather than separate processes per document type.
Do this in a fraction of the time
Diligio centralises your approved answers, drafts each response grounded in your sources, and independently verifies it before you review. RFPs, DDQs, and security questionnaires, answered from one knowledge base.