Writing a one-page thesis for the company
Core idea#
A one-page thesis is a short written argument for why your company should exist: the problem, why your approach wins, who will pay, why now, why you, and what you'll prove next. It isn't a business plan or a pitch deck. It's the thinking underneath both, compressed onto one page so that you, your co-founders and anyone you share it with can see the whole argument at once and find the weak points.
Why write one:
- It forces clarity. If you can't fit the argument on a page, you don't yet understand it well enough.
- It aligns the team. Co-founders discover disagreements about the customer or the first product early.
- It's reusable. The same page becomes the basis of fellowship applications, grant summaries, pitch decks, investor emails and your website.
- It's testable. Each sentence is a claim you can check with customers, data or experiments.
Who it's for: founders at the end of the minus-one stage (playbook 1.04), before applying to fellowships, accelerators or investors. The best time to write the first version is after 20 or more customer interviews (playbook 1.19).
The template#
Nine short sections, about 400 to 500 words in total. Write in plain language a smart nonspecialist can follow.
| # Section |
What to write | Length | Test it with |
|---|---|---|---|
| 1 One-line summary |
"We make [product] for [customer] that |
1 sentence | Can a stranger repeat it back? |
| [outcome], using [technology]." |
| # | Section | What to write | Length | Test it with |
|---|---|---|---|---|
| 2 | Problem | Who has it, how often, what it costs them now (money, time, risk). Use a number. |
2–3 sentences |
Customer interviews (1.19) |
| 3 | Current solutions and why they fall short |
What customers do today and its limits. |
2–3 sentences |
Interviews; competitor research |
| 4 | Our approach and why it wins |
What's different about your technology, in outcome terms (cheaper, faster, possible for the first time). One sentence on how. |
2–3 sentences |
Lab data; benchmarks |
| 5 | First customer and business model |
The specific first segment, who buys, how much they'd pay, how you'll sell. |
2–3 sentences |
Pilots, letters of intent |
| 6 | Market | First market size, built bottom-up, and the larger opportunity (1.08). |
2 sentences |
Your market model |
| 7 | Why now | The change that makes this possible or urgent today (1.09). |
1–2 sentences |
Dated evidence |
| 8 | Why us | The team's specific advantages and how you'll fill gaps (1.09, 1.18). |
2–3 sentences |
Advisers' and investors' reactions |
| 9 | Next 18 months and the ask |
Three milestones that remove the biggest risks, what they cost, and what you're asking the reader for. |
3–4 sentences |
Your budget (1.05) |
Add two short lists at the bottom#
- Key risks (technical, market, regulatory, team), each with how you'll test or reduce it. Assumptions to test next, the three claims you're least sure of.
Investors and reviewers trust a thesis that names its own weak points.
Worked example (illustrative)#
This uses the corrosion-sensor company from playbook 1.08. The company and figures are invented to show the format.
PipeSense: one-page thesis (v3, March)
1. Summary. PipeSense makes low-cost wireless sensors that continuously monitor corrosion inside industrial pipes, so refineries and chemical plants can replace most manual inspections and catch failures earlier.
2. Problem. A typical refinery has around 2,000 corrosion monitoring points, each inspected by hand about twice a year at roughly $150 a time: about $600,000 a year per site. Between inspections, corrosion goes unseen; inspection managers told us one unplanned shutdown can cost far more than a year's inspection budget.
3. Current solutions. Manual ultrasonic inspection is slow and periodic. Existing permanent monitors cost too much to install at more than a few critical points.
4. Our approach. Our sensors use a thin-film ultrasonic transducer developed at [lab] that costs about a tenth of current permanent monitors and runs for five years on a battery. Plants can instrument hundreds of points instead of a handful.
5. First customer and model. Mid-sized refineries and chemical plants in the US, Europe and India, starting with three plants we've interviewed. We'll charge about $90,000 per site per year (hardware plus monitoring), around 20% of the value created. We'll sell directly to inspection and reliability managers, then through inspection service companies.
6. Market. About 1,800 target sites spend roughly $1 billion a year on manual inspection, giving a first market of about $160 million a year at our price. Pipelines and power plants could roughly triple it.
7. Why now. Thin-film transducer costs have fallen below the threshold where dense sensing pays back in under a year, and new integrity regulations are pushing plants towards continuous monitoring.
8. Why us. Our CTO invented the transducer (two patent filings). Our CEO spent ten years selling inspection services to refineries. An adviser ran asset integrity at a major oil company. We need a hardware manufacturing lead, our first hire.
9. Next 18 months and the ask. (1) Run paid pilots at two plants and show 80% of manual points can be replaced; (2) demonstrate five-year battery life in accelerated testing; (3) sign one multi-site contract. This needs about $1.5 million. We're raising a pre-seed round and seeking a lead investor with industrial hardware experience.
Key risks. Sensor reliability in high-temperature lines (testing at pilot sites); long enterprise sales cycles (selling through inspection firms in parallel); certification for hazardous areas (started with a certification body).
Assumptions to test next. Share of points replaceable; willingness to pay 20% of value; installation time per sensor.
About 480 words. Each sentence is a claim the team can show evidence for, or has marked as a risk.
Testing and using the thesis#
Review it with three kinds of reader
- A potential customer: "Is the problem described accurately? Would you pay that?" 2. An investor or experienced founder: "What's the weakest sentence?" 3. A smart non-specialist (a friend in another field): "What didn't you understand?"
Rewrite after each round. Most theses get much better between version one and version three.
Keep it alive#
- Date and version it. Keep old versions; they show how your thinking changed. Update it monthly at pre-seed, or after any major learning (a pilot result, a lost customer, a new competitor).
- Review it with co-founders every quarter. Disagreement about a sentence is worth a meeting.
Reusing it#
| Use | How to adapt |
|---|---|
| Pitch deck | Roughly one slide per section; the thesis is the script |
| Investor email | Sections 1, 2, 7 and 9, in five sentences |
| Fellowship and accelerator applications | Expand sections 4, 8 and 9; most |
| (1.10, 1.14) | applications ask exactly these questions |
| Grant applications | Expand the technical approach and milestones; add social or economic impact |
| Use | How to adapt |
|---|---|
| Website | Sections 1 to 4, in customer language |
| Hiring | Sections 1, 2, 7 and the team's mission |
Country notes#
- India: government grant and incubator applications (SISFS, BIRAC BIG, NIDHI; playbooks 1.10, 1.11) usually ask for technology readiness level, national or social impact and alignment with policy missions. Add a short line on each; keep the core argument the same.
- US: SBIR/STTR proposals emphasise technical merit and commercial potential separately; the thesis maps neatly onto both. Investors often want the market and "why now" sections sharper.
- UK: Innovate UK and fellowship applications ask about the innovation, the market, the team and value for money; spinout investors will also look closely at the IP position (playbooks 2.03, 2.11).
Common mistakes#
- Writing a technology description, not a company thesis. Lead with the customer's problem.
- No numbers. "Large market" and "huge cost" mean nothing; use your best estimate and say where it came from.
- Hiding the risks. Naming them builds credibility.
- Going over a page. Cut adjectives first, then repeated points.
- Writing it once. It's a working document; update it as you learn.
- Jargon. If a smart non-specialist can't follow it, investors outside your field won't either.
- Disclosing the invention. Describe outcomes, not methods, until patent filings are in (playbooks 1.13, 2.04).
Related playbooks#
- 1.04 The minus-one stage
- 1.07 Tech-push vs market-pull
- 1.08 Sizing a market that does not exist yet
- 1.09 Founder-market fit
- 1.10 Fellowships for pre-company founders
- 1.19 Customer discovery from inside the lab
Sources and further reading#
- The thesis structure draws on common elements of investment memos and pitch guidance: the problem, solution, market, why now, team and milestones.
- Pear VC, Market sizing guide, for presenting the market section.
- Steve Blank and Bob Dorf, The Startup Owner's Manual (2012), on turning hypotheses into tests.
Worked example is illustrative. Last checked November 2026.