You’ve sat through the pitch. The deck was polished, the case studies looked impressive, and the numbers were hard to argue with.
The problem? A well-designed PDF is not the same as proof.
Most executives and sales leaders evaluating a marketing partner don’t have a reliable way to vet whether a case study holds up. The result is a selection process that comes down to gut feel and presentation quality rather than verified outcomes.
A curated case study and a verifiable outcome aren’t the same thing, and this framework is how you tell the difference before you sign anything.
Case Studies Are Easy to Cherry-Pick
According to the B2B Content Marketing 2025 Benchmarks and Trends report, 75 percent of B2B marketers used case studies or customer stories in the last 12 months.1 Every agency has them. The question is, what’s inside?
Case studies are genuinely valuable as proof points when the result behind them is real. But a case study that reads like every other agency’s (generic industry, familiar percentage, a client name that could be swapped out for any other) doesn’t differentiate anything.
Having case studies isn’t the value. The value is whether the story could only be about your firm.
That’s the differentiation problem. There’s a separate one worth watching for: even a case study that sounds distinctive can still be curated to look better than the result. The agency chose the client, chose the metric, chose the timeframe, and wrote the narrative. Nothing about that process is inherently dishonest, but it does mean what you’re reading has been filtered. The headline number, “increased leads by 300 percent,” for example, rarely comes with the context that makes it meaningful. A 300 percent increase over three months in a new market with a massive ad spend behind it is a very different story than the same increase over 12 months through organic content and earned visibility.
The number stays the same. What it took to get there doesn’t.
Pro Tip: Ask for the case study’s raw timeline, not the rounded one. “Six months” and “five and a half months, with two of them spent fixing a broken funnel” tell very different stories. Reach out for a walkthrough on how we timeline and report on our own campaigns →
Questions to Ask About Any Case Study
Walking into an evaluation with a prepared set of questions changes the dynamic of the conversation. It signals that you’re not just a buyer but a decision-maker who knows what “good” looks like. These five questions should be in your back pocket before any agency review.
- What was the baseline before the engagement started? Without knowing the starting point, a percentage increase is meaningless. Ask what the specific metric looked like before the agency got involved.
- What was the timeframe, and what changed during that period? Results look different over three months versus 18. Also ask whether anything else shifted during that window. From budget to headcount to market conditions, you need a clear picture of everything else that changed. Results don’t happen in a vacuum.
- What was the methodology, and is it repeatable for a company like mine? A tactic that worked for a funded startup in a hot market may not translate to a mid-market B2B company with a different buyer profile. Ask how the strategy was built and whether the approach is transferable to your business.
- What didn’t work, and how did you adjust? Agencies that can only talk about wins haven’t shown you how they operate under pressure. A real engagement involves course corrections. Ask what went wrong and what they did about it.
- Is this result still holding, or was it a short-term spike? Some results are meaningful in the moment and erode quickly. Ask whether the outcome is sustained and what they’ve done to maintain it.
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feel like guesswork.
Allied Insight helps turn scattered tactics into integrated strategies—content that builds credibility, campaigns that drive pipeline, and systems that scale.
Vetting Checklist: What Makes an Outcome Verifiable
Not every outcome in a case study is equally verifiable. Some are more reliable indicators of real impact than others. When reviewing a case study, look for these signals:
✓ Specific metrics tied to a defined timeframe, not open-ended claims
✓ Attribution that explains what drove the result, not just that the result happened
✓ Evidence of ongoing results, not a one-time spike
✓ Verifiable clients, whether named publicly or confirmable through a reference call
✓ Acknowledgment of what the client contributed alongside the agency’s work
✓ Before-and-after comparisons with clear baselines on both ends
✓ Results that connect to revenue, pipeline, or conversion, not just traffic or impressions
Even with solid answers to the questions above and a checklist that looks clean, there’s a point where a written case study simply can’t give you what you need. That’s when you ask for a reference call: a direct conversation with a past or current client, not one the agency sets up and sits in on, where you can ask your own questions and get an answer nobody edited.
A reference call matters more than a case study when the engagement you’re considering is large, long-term, or involves a significant shift in your marketing direction. It also matters when the agency’s experience in your specific industry or buyer type is central to the decision. Speaking directly to a past or current client gives you something no document can: an unfiltered read on what it’s like to work with that team.
Ask us these questions.
We’d rather you interrogate our work than take a pitch at face value, ours included. Ask what a Next90 Report tracks. Ask what dropped last quarter, not just what grew. Ask for a reference call. Connect with us today and bring the checklist above with you.
Reference
- Stahl, Stephanie. “B2B Content Marketing Benchmarks, Budgets, and Trends: Outlook for 2025.” Content Marketing Institute, 9 Oct. 2024, contentmarketinginstitute.com/b2b-research/b2b-content-marketing-trends-research-2025
