Writing an RFP looks deceptively simple. In practice, even experienced procurement teams fall into patterns that reduce supplier participation, generate poor-quality responses, and ultimately lead to worse buying decisions. Here are the ten most common mistakes and — more importantly — how to fix them.
1. Vague Requirements
The mistake: Requirements like "the system must be scalable" or "the vendor must have relevant experience" are impossible to evaluate objectively. Different suppliers will interpret them differently, and you will end up comparing responses that are not actually comparable.
The fix: Write requirements that are specific and measurable. "The system must support 1,000 concurrent users with 99.9% uptime" is evaluable. "The vendor must provide references from at least three engagements of $500K+ completed within 24 months" is evaluable. If you cannot write an acceptance test for a requirement, it is too vague. For more guidance, see our Complete Guide to Writing an RFP.
2. No Evaluation Criteria Published Upfront
The mistake: Deciding how to evaluate responses after you receive them. This creates unconscious (or conscious) bias — criteria get shaped around a preferred supplier's strengths.
The fix: Define and publish evaluation criteria and their weights before issuing the RFP. Include them in the document. This is both a fairness and a quality measure — suppliers who know how they will be scored write better proposals. See our scoring framework guide: How to Evaluate Vendor Proposals.
3. Impossible Deadlines
The mistake: Issuing an RFP on Monday with a submission deadline the following Friday. Suppliers receive dozens of RFPs. If your timeline signals that you have not thought seriously about the process, the best suppliers will not bid — and those who do will submit boilerplate responses.
The fix: Allow a minimum of 14 days for simple RFPs, 21–28 days for moderate complexity, and 30–45 days for large or multi-phase procurements. If you are under internal pressure to move fast, address the root cause rather than compressing the supplier timeline.
Top-tier suppliers receive far more RFPs than they respond to. An unrealistically short deadline is often enough for a qualified supplier to decline to bid entirely.
4. Too Many Questions
The mistake: Asking 100+ questions in an RFP in the name of thoroughness. Every question requires supplier effort. A 100-question RFP is a deterrent for smaller, high-quality boutique suppliers who simply will not have the bandwidth to respond.
The fix: Audit your question list. For each question, ask: "Would the answer materially change my evaluation?" If not, cut it. A focused 30-question RFP will generate higher-quality responses than a comprehensive 100-question document.
5. Ignoring Supplier Feedback During Q&A
The mistake: Treating the Q&A period as a formality. Suppliers often identify genuine ambiguities, conflicting requirements, or unrealistic timelines through their questions. Dismissing these signals leads to worse proposals.
The fix: Treat supplier questions as free consulting. If multiple suppliers ask the same question, that section of your RFP needs clarification. Issue a formal addendum addressing all questions — do not answer suppliers individually, as this creates information asymmetry.
6. No Budget Range
The mistake: Withholding budget information to avoid "anchoring" suppliers to a high number. This is a well-intentioned but counterproductive practice. Without budget context, suppliers either guess conservatively (leaving money on the table for scope) or pitch solutions that are wildly over or under budget.
The fix: Provide a budget range. This does not tell suppliers your maximum — it tells them the scale of solution that is appropriate. A supplier who knows the budget is $200K–$300K will propose a materially different solution than one who thinks it might be $50K or $2M. Better-scoped proposals mean a faster, more confident selection.
7. Poor Supplier Distribution
The mistake: Inviting the wrong number of suppliers. Too few (one or two) undermines competition. Too many (ten or more) creates an unmanageable evaluation burden and signals to sophisticated suppliers that the process is a box-checking exercise.
The fix: Aim for three to seven qualified suppliers. If you do not have a shortlist, run an RFI first to build one. Qualify suppliers before you invite them — reviewing whether they meet basic criteria before committing their time (and yours) to a full RFP process.
8. Missing NDA for Sensitive Documents
The mistake: Sharing sensitive financial data, architectural diagrams, internal processes, or strategic plans with suppliers who have not signed a non-disclosure agreement. Once information leaves your organization, you have limited control over how it is used.
The fix: Require NDA execution before releasing any RFP containing sensitive information. This is standard practice in many industries. Procurement platforms can automate NDA delivery and signature tracking, so it does not add meaningful friction to the process.
9. No Mandated Response Format
The mistake: Allowing suppliers to respond in any format they choose. You end up comparing a 10-page executive summary, a 60-page technical document, and a slide deck — none of which answer the same questions in the same order.
The fix: Specify the response format explicitly. Provide a structured template or outline that suppliers must follow. Number your requirements so suppliers can respond point-by-point. Standardized formats make evaluation faster, fairer, and more defensible.
10. Skipping the Post-Award Debrief
The mistake: Selecting a vendor and moving straight to contracting, with no communication to unsuccessful suppliers. This is both a missed improvement opportunity and a reputational risk — suppliers talk to each other.
The fix: Offer a brief debrief to unsuccessful suppliers, especially those who invested significant effort in their proposals. Explain the evaluation outcome in general terms. This closes the loop professionally, preserves supplier relationships for future procurements, and — critically — you often learn about gaps in your own RFP that you would not have seen otherwise.
Before publishing your next RFP, run through this list as a pre-flight check. Better yet, use a structured template that builds many of these best practices in by default.
Avoiding these ten mistakes does not require a larger team or a bigger budget. It requires discipline, transparency, and respect for the suppliers you are asking to invest their time in your process. The payoff is higher-quality proposals, more competitive pricing, and better long-term supplier relationships.