Vague claims are the most common and most damaging mistake on the past performance page. “Helped clients grow.” “Improved conversions.” “Delivered results.” These phrases appear in virtually every proposal, which means they register as noise rather than signal. The buyer’s eye skips them. Their brain files them under “everyone says this.” Specific numbers, specific timeframes, and specific mechanisms do the opposite, they stop the scan, trigger evaluation, and activate the core persuasion mechanism that vague language never can: social proof with enough detail to be believable.
Why Vague Claims Are Actively Harmful
Robert Cialdini’s principle of social proof works when the proof is credible. Credibility requires specificity. A claim that “we’ve helped many clients improve their marketing results” is technically social proof but contains no information the buyer can evaluate. It could describe anyone. It probably does describe everyone.
When a claim is too vague to evaluate, the buyer’s default response is skepticism. They’ve seen the same language from every other consultant in their inbox. Generic language doesn’t just fail to persuade, it actively signals that you have nothing specific to say, which raises doubt about whether the results were real.
Specific numbers do the opposite. “Reduced customer acquisition cost from $214 to $87 over a 4-month paid social restructure” contains five pieces of verifiable information: the metric, the before-state, the after-state, the timeframe, and the method. Each piece adds credibility. Together, they create a claim that’s memorable, differentiating, and almost impossible to dismiss.
The Specificity Audit: Four Questions for Each Claim
Run every past performance claim through the Specificity Audit before the proposal goes out.
Question 1: Does the claim include a before-state? “Increased revenue” fails. “Revenue increased from $28K to $74K monthly” passes. The before-state anchors the result and shows the buyer where the engagement started, which matters because they’re comparing to their own starting point.
Question 2: Does the claim include a timeframe? “Grew the email list by 4,200 subscribers” fails. “Grew the email list by 4,200 subscribers in 90 days” passes. A timeframe makes the result credible and comparable. Without it, “4,200 subscribers” could have taken five years.
Question 3: Does the claim name the mechanism? “Improved SEO rankings” fails. “Increased organic sessions from 1,100 to 6,800 monthly by rebuilding the content architecture and targeting 34 bottom-of-funnel informational queries” passes. The mechanism tells the buyer how the result was produced, which is what they’re actually evaluating when they ask whether you can do this for them.
Question 4: Is the claim relevant to this buyer? A specific result from an irrelevant industry, scale, or problem type provides less persuasive value than a general result from a directly analogous one. A specific result from a directly analogous client is the most persuasive possible claim you can make. Curate your three to four strongest, most relevant entries rather than including everything you’ve ever measured.
The Three-Sentence Entry Format
Each past performance entry should follow the same structure: stat hook, context, method.
Stat hook (sentence 1): Lead with the specific numbers. “Monthly recurring revenue grew from $31K to $79K over a 5-month engagement.” This is the first thing the buyer sees and the line that determines whether they read on.
Context (sentence 2): One sentence on the situation. “The client was a B2B HR tech platform that had plateaued at the same revenue level for 11 months and was losing high-value accounts to a new competitor.” This tells the buyer who the work was done for and whether the situation resembles their own.
Method (sentence 3): One sentence on what you did. “We rebuilt the upsell sequence, introduced a 3-tier customer success touchpoint model, and identified the 20% of accounts responsible for 70% of churn risk.” This answers the buyer’s implicit question: “Is this result reproducible for me?”
Total length: 60–90 words per entry. This is short enough to be read quickly and specific enough to be remembered.
The mechanism sentence is the most important. Anyone can claim a result. Explaining how the result was produced demonstrates that it was intentional, systematic, and therefore transferable, which is what the buyer needs to believe before they will pay you to replicate it.
Matching Results to the Buyer’s Primary Concern
Not all buyers are optimizing for the same metric. A growth-stage startup cares about MRR and pipeline velocity. A mature SMB cares about margin improvement and cost reduction. An operations leader cares about team adoption and time saved. A compliance-heavy industry cares about risk reduction and audit outcomes.
The past performance page performs best when the results you feature match the buyer’s primary concern as established in the discovery conversation. If the buyer spent 20 minutes talking about their customer retention problem, your most prominent case study should show a retention result, not a revenue result, even if the revenue result is more impressive in absolute terms.
How to Collect Better Data Going Forward
The best time to collect performance data is 60 to 90 days after an engagement ends, not at the moment of delivery, when the buyer is focused on the handoff. Build a brief check-in into your post-project process: a single email asking the buyer to share what has moved since the engagement closed. Most satisfied clients will respond. The specific number they share is your next past performance entry.
Audit your existing case studies this week. For every claim that contains no before-state, no timeframe, and no mechanism, either rewrite it with the specifics or remove it. Three sharp, specific entries outperform ten vague ones every time.
