The riskiest claim is rarely the one you're working on.
The Venture Stack maps every venture as six layers of claims on one founder bedrock — and shows you which untested assumption would collapse the most if it were wrong. Test that one first.
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A field guide for founders
The Venture Stack
Test what would kill you first. Evidence is the only scarce asset left.
FIRST EDITION
// The rule
Test your riskiest, least-validated, load-bearing assumption first.
It's usually lower in the stack than the one you want to work on. Start anywhere — solution-first, channel-first, all normal. The map routes you down to the claim that would collapse the most if it were wrong.
// The map
Six layers. One bedrock.
Every venture is a stack of claims, and the lower ones carry the weight. Most founders polish the top — the product, the pitch, the pricing — while the claims underneath have never touched reality.
Each chapter walks one layer: the premise it states, the assumptions it carries, where founders fake it, and the experiment to run this week.
06Capture
How does this become an engine? Revenue, unit economics — and the moat showing up in real cohorts.
05Delivery
How do you reach and serve them, reliably? Channels are where most ventures quietly die.
04Solution
What delivers progress 10x better — and what named mechanism would make that hard to copy?
03Customer
Who feels this most acutely — a beachhead you could name, count, and reach?
02Job
What progress is the customer actually seeking? Observed, not invented.
01Foundation
Why this, why now, why you? Timing and a real insight — not a vision statement.
runs on
00Founder — the bedrock
What can you sustain? Fit, personal runway, energy, obligations. If this fails, everything above it is homework.
// Inside the book
160 pages. Twelve chapters. Zero fluff.
Short chapters at student and first-venture scale. Every chapter ends the same way: a killer question and a this-week exercise. The repetition is the pedagogy.