An idea validation framework is a fixed sequence of tests with the pass mark written down before you run them. This one has four gates: problem, buyer, commitment, money. Each gate names the evidence that counts, the number you have to hit, and what you’ll spend getting there. Fail a gate, and you stop or change one specific thing.
TL;DR
- Validation rarely fails on the tests. It fails because nobody set the pass mark first, so whatever comes back reads as encouraging.
- Four gates, in order: is the problem real, can you name and reach the buyer, will they give up something that costs them, will they pay.
- Every gate has a different evidence bar. Enthusiasm from people who know you clears none of them.
- Decide the numbers and the budget before you start. That’s the part every other framework leaves out.
The number nobody writes down
Twelve interviews in, an honest founder can tell you exactly what she heard: eight people said the problem was real, four said they’d probably pay, nobody laughed her out of the room. So she built for four months. The product landed to silence.
Nothing in that story is a bad test. The interviews were fine. What was missing is a number written down beforehand that said eight out of twelve means go, six means stop. Without it, results don’t get evaluated, they get interpreted, and interpretation always leans toward the thing you already want to build. “No market need” remains the most common cause of startup death in CB Insights’ post-mortem analysis, and the founders in those post-mortems were rarely lazy. Most of them tested. They just graded their own homework afterwards.
So the first move in any validation framework is clerical, not strategic: open a document, write the four gates, and fill in the pass column before you talk to anyone.
The four gates
Run them in this order. The order isn’t arbitrary: each gate is cheaper than the one after it, and each one kills a different idea. Skipping ahead means paying for a test whose answer an earlier gate would have given you free.
| Gate | The question it settles | What counts as evidence | Pass mark (you set this first) | Budget |
|---|---|---|---|---|
| 1. Problem | Does this cost them enough that they’ve already tried to fix it? | Unprompted accounts of the problem in the last 90 days; a workaround they built, bought, or hired for | e.g. 7 of 10 target-buyer conversations describe it without you naming it | ~1 week |
| 2. Buyer | Can you name one segment and reach it repeatedly? | Named places where they gather: specific communities, lists, events, search terms with real volume | e.g. 3 channels you can reach twice a week without paying a gatekeeper | ~2 days |
| 3. Commitment | Will a stranger give up something that costs them? | Email from cold traffic, a booked call, a waitlist deposit, a signed letter of intent | e.g. 20 signups and 5 booked calls from 200 targeted visitors | ~1 week + a small ad budget |
| 4. Money | Will they pay before the thing exists? | Pre-order, deposit, paid pilot, a card actually charged | e.g. 3 pre-orders at the real price, not a discount | 1–2 weeks |
The pass marks above are examples, not benchmarks. Nobody can hand you the right number for your market, and anyone who prints one is guessing. Pick yours from what the decision costs: if failing means you lose a weekend, set a loose bar. If it means you quit your job, set a bar that scares you.
Gate 1: the problem, not the solution
The evidence that clears this gate is always historical. What did they do about it last time it happened, how long did it take, what did it cost them. Rob Fitzpatrick’s The Mom Test is the whole method in one book: ask about past behaviour, never about future intent, because future intent is free to promise. A person who built a spreadsheet to survive your problem has told you more than ten people who say the idea sounds useful.
Gate 2: one buyer, reachable twice
Founders skip this one and pay for it at Gate 3, when they discover there’s no way to put the page in front of the right people. Reachability is a real constraint, not a marketing detail. If your buyer is “small business owners,” you don’t have a buyer; you have a census category. Narrow until you can name three specific places you could show up on Tuesday.
Gate 3: something that costs them
Attention is free, so it proves nothing. The cheapest costly thing is usually an email address given by someone who found you cold, and the strongest is a scheduled call, because a calendar slot costs time that can’t be refunded. This is the gate where a demand page earns its keep: send targeted traffic to a page that asks for a commitment, then count. The tactics live in our guide to validating a startup idea.
Gate 4: money before the product
Charging early isn’t about revenue at this stage. A person who pays becomes a different kind of informant: specific, impatient, and honest about what’s missing. If a pre-order is genuinely impossible in your market, substitute the nearest costly commitment, like a signed pilot agreement with a start date. Substituting interest is how founders talk themselves through this gate without passing it.
What doesn’t count
- “I’d definitely use that.” Future intent, offered for free, usually to be kind.
- Friends, colleagues, your own followers. They’re responding to you, not to the idea.
- Survey answers about hypothetical purchases. Ask a hundred people if they’d buy and you’ll learn about politeness.
- Free signups from untargeted traffic. A viral post brings tourists. Gate 3 counts strangers who came from a channel you can use again.
- Advice from other founders, including good advice. They’re guessing about your market with less information than you have.
Copy this
Paste it, fill the pass column, and don’t edit that column after the data arrives.
IDEA: ________________________ DATE: ________
BUYER (one segment, specific): ________________
GATE 1 — PROBLEM pass mark: ____ / ____ conversations result: ____ □ pass □ fail
GATE 2 — BUYER pass mark: ____ reachable channels result: ____ □ pass □ fail
GATE 3 — COMMITMENT pass mark: ____ from ____ cold visits result: ____ □ pass □ fail
GATE 4 — MONEY pass mark: ____ paid at $____ result: ____ □ pass □ fail
TOTAL BUDGET BEFORE DECIDING: ____ days, $____
IF A GATE FAILS TWICE, I STOP. Signed: ________
The signature line is not a joke. It’s there because the version of you reading the results is more optimistic than the version writing the plan.
Where this breaks
Long enterprise sales cycles bend Gate 4 out of shape: a six-month procurement process can’t produce a pre-order in two weeks, so the honest substitute is a champion who will put a pilot date in writing. Brand-new categories bend Gate 1, because people can’t describe a problem they’ve never had a name for, and you have to look for the workaround instead of the complaint. Regulated markets bend everything, since the binding constraint is approval rather than demand.
What doesn’t bend is the pass mark. The moment you start deciding what a result means after seeing it, you’ve stopped running a framework and started building a case.
If you’d rather not run the gates by hand, compare the tools that do parts of this honestly, including where each one beats us, or see how a scored report differs from an evidence run in ProofMachine vs ValidatorAI. And when Gate 3 passes, the next problem is recruiting the people who cleared it: that’s getting your first users.
Steve Blank’s customer development writing is still the best free background reading on why any of this works.