Which Case Study to Send: The Proof Match

What you'll get

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Proof match

How to use it

The hack

before any case study goes to a named account, list your proof in one line per story, paste what you know about the account underneath, and ask your AI assistant to rank which story this buyer would recognise themselves in. It must quote the matching fact for every rank. Send the one story that wins, not the three that might.

The hack: before any case study goes to a named account, list your proof in one line per story, paste what you know about the account underneath, and ask your AI assistant to rank which story this buyer would recognise themselves in. It must quote the matching fact for every rank. Send the one story that wins, not the three that might.

Why the biggest number loses

Sellers pick proof by size: the largest client, the best-known logo, the biggest result. Buyers pick by resemblance: have these people solved my problem, at my kind of company? A mid-sized logistics firm reading your famous banking case study concludes two things, that you are expensive and that you are used to someone else's problems. Resemblance is hard to judge from the inside, because you know the hidden similarities between the old project and the new account. The buyer only ever sees the surface ones, and the surface is what the ranking has to be built on.

The prompt

Proof match

Here are our case studies, one line each: industry, client size,
the problem, what we did, the outcome.

[list]

Here is what we know about [account]: industry, size, the problem
we believe they have, anything public about their situation.

[facts]

Rank the case studies by how strongly this buyer would recognise
their own situation in each. For every rank, quote the one account
fact that matches and the one that does not. If no story is a
credible match, say so and name the closest honest angle instead.

Do not invent any detail about the account or the case studies.

Read the result

The quoted facts are the test. A story ranked first on a quote like "both are B2B companies" has no match, it has a category. A story ranked lower on "same ERP migration, half the company size" may be the one to send, because the buyer will see the mirror at a glance. And the most valuable answer is "no credible match": it tells you to lead with something else, a reference call, a relevant person on your team or a small paid first step, rather than stretch a story that will read as somebody else's.

Three mistakes to avoid

Accepting a rank without its quote. Asked to rank, a model will find likeness anywhere, which is why the prompt demands the matching fact. A rank that cannot quote one is filler, and sending proof on it wastes the one attachment a first message can carry.
Sending the top three. Three stories read as a brochure; one story reads as a judgement about what this account needs. Keep the rest for later conversations, where each has a reason to appear.
Ranking against a thin fact sheet. The match is only as good as what you know about the account. If the facts column is two lines long, do the research first; the account research prompt pack covers how to gather it. The proposal echo check does this job later in the deal, when the document itself must mirror the account.

Make it a habit: no case study is attached to a first or second message until the match has run and the winning story can quote the account fact it matched.

Why this works on named accounts

On a lead list, proof is a brochure: the same two logos attached to every message, because nobody knows which reader is behind the address. On a named account the question reverses. You chose this company and you know its industry, size and situation, so the right question is not which story is our best but which story is their closest mirror. A buyer who recognises their own problem in your case study does half the qualification for you. One that does not quietly concludes you have never met a company like theirs.

How account-based selling works →

More from the Academy

Set-up prompt (run once)

You are helping me research one company so I can have a useful first conversation with people there. I sell [what you sell, in one sentence] to [type of company]. The problem we solve is [problem, in the customer's words].
 
Rules for this whole conversation:
- Use only the sources I paste, or web results you can link to. Cite the source for every factual claim.
- If something is not in the sources, write "unknown". Do not guess names, numbers or dates.
- Keep facts and your own inferences separate, and label inferences as "inference".
- Write in plain English and keep answers short.

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15 AI Prompts for Account Research

For sellers who use Claude, ChatGPT or Perplexity to prepare for an account.

You leave with a set-up prompt, 15 research prompts in working order, a fact check that catches invented details and a sample of its output.

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Account brief skill file

Name: Account brief
Description: Use when I ask for a brief on a company I plan to sell to. Builds a one-page account brief only from documents I give you, and says what it could not find.
 
About me: I sell [what you sell] to [who buys it]. Keep this in mind when you decide what matters, but never state it as a fact about the company.
 
Rules
1. Use only the documents I paste or attach in this chat. If I have given you none, ask for them and stop.
2. Do not use your memory for any fact about the company: figures, names, dates, products or customers.

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Account Brief Skill File for Claude and ChatGPT

For sellers who brief themselves on large accounts again and again.

You leave with a ready skill file, three ways to load it, a document list, a five-step test and a rule for keeping it honest.

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The Proof Match: Which Case Study to Send a Named Account