How can an angel test the market assumptions behind a pre-revenue B2B SaaS startup?

Test market assumptions from the buyer upward. A large category does not establish reachable demand, willingness to pay, or a route to a customer. Separate the initial target segment from the founder's longer-term expansion story.

Start with the decision

Reconstruct the buyer count, purchasing unit, adoption constraints, and competitive alternative. Ask what evidence supports each input and compare a smaller reachable segment. Preserve disagreements rather than choosing the largest plausible number.

The illustrative scenario

This is an educational workbook. The company or fund and all numerical inputs below are fictional. They are not ADIN results, customer claims, market benchmarks, or a forecast.

The fictional company is testing a reporting tool with three operations teams. Users attend demos, but no recurring contract is signed. The founder wants financing to complete integrations and test a repeatable sale.

A pilot conversation, active usage, an invoice, and a recurring commitment describe different evidence. Treat projected sales as assumptions and ask which milestone financing can realistically support.

Turn the scenario into an evidence decision

Consider a review of a pre-revenue B2B SaaS startup in which a confident explanation arrives before the supporting records. Start with the first question in the table. Write down what an answer would change: the next interview, the experiment's scope, a request for specialist review, or a decision to wait. A question without a consequence can produce a longer document while adding little understanding.

Next, inspect the record named in the table and record its date, owner, permission boundary, and limitations. Review permissioned pilot notes, usage records, customer references, and a dated cash forecast. Clarify what is confirmed by the customer rather than inferred by the founder. If the record contradicts the explanation, preserve both accounts and ask which definition, period, or workflow differs. Do not silently select the version that makes the opportunity look strongest.

Finish with a conditional statement: if the specified evidence supports the claim under these conditions, take the named next step; otherwise investigate the unresolved question. A market model can be arithmetically correct and commercially weak. Use it to find the input requiring investigation, rather than treating the final product of two assumptions as proof of an opportunity. This worked exercise is about the decision process. It does not assert that a fictional company has met a real diligence standard or that a template can authorize an investment.

Use this worksheet

Answer the questions with a source, date, owner, and next action. Mark an unknown as unknown. Use public or permissioned information and involve a qualified specialist when a question requires expertise beyond the team’s competence.

1. Who is the actual buyer?
2. How is the buyer population counted?
3. What budget exists?
4. Which adoption constraint matters?
5. What evidence supports expansion?

Questions specific to this scenario

• Who owns the customer's budget?
• What milestone comes before the next raise?
• Which projection has independent support?

Review permissioned pilot notes, usage records, customer references, and a dated cash forecast. Clarify what is confirmed by the customer rather than inferred by the founder.

A concrete next test

Ask a pilot participant to describe the last time the reporting problem occurred and the next approval needed for a purchase. Compare that account with the founder's pipeline stage. Record an explicit unresolved step rather than interpreting meeting attendance as contract intent.

Interpret the result

A market model can be arithmetically correct and commercially weak. Use it to find the input requiring investigation, rather than treating the final product of two assumptions as proof of an opportunity.

Compare the current evidence with the specific next milestone. An attractive market story does not establish that this team can reach its buyer.

Sources and method

These primary resources provide background for the concepts. The fictional scenario, calculations, and worksheet are ADIN educational examples; the sources do not report or validate those invented results. Reviewed October 11, 2026.

• Angel Capital Association: Knowledge Center
• Investor.gov: Private Equity Funds