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A clear step-by-step on running the 40% test correctly - who to survey, when, and how to avoid the sampling mistakes (resurveying the same users, surveying first-timers) that make the score meaningless.

Product-Market Fit Survey Guide: Sean Ellis 40% Test Template

From Learning Loop by Learning Loop

Explains who qualifies to be surveyed (used the product at least twice, recently)
Covers how to calculate and interpret the PMF score with benchmarks
Recommends running the test quarterly on fresh cohorts to track trend, not a single snapshot

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Answers How do I know if my D2C brand has actually reached product-market fit, or if I'm just imagining it from a few good sales days?

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