---
title: "Stage 3 — Run buyer-side evidence tests (days 3–10, as feasible)"
slug: "do-it-yourself-game-plans/stage-3-run-buyer-side-evidence-tests-days-3-10-as-feasible"
section: "Do-it-yourself game plans"
description: "Create five hypotheses and five ways each could be wrong; conduct suggested 5–10 focused interviews or product observations, with the size adapted to the d"
internal_only: false
---

# Stage 3 — Run buyer-side evidence tests (days 3–10, as feasible)

Create five hypotheses and five ways each could be wrong; conduct *suggested* 5–10 focused interviews or product observations, with the size adapted to the decision rather than sold as statistical proof. Prioritise recent buyers, non-buyers and churned users; ask about real behaviour and alternatives, not whether a speculative feature “sounds useful”. YC's interview guidance is a practical reference. [How To Talk To Users — Y Combinator](https://www.youtube.com/watch?v=z1iF1c8w5Lg)

**Deliverables:** interview guide, redacted notes, demand-versus-politeness map, observation log. **Pitfall:** selecting only fans or treating interview counts as representative market measurement.