📋 Template
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Beginner
Why we picked it The Test Card is a one-page worksheet that forces a vague market-size belief into four fields: what we believe, how we will test it, what we will measure, and what result would prove us right. Fill one out for each cofounder's version of the market and the disagreement stops being a debate and becomes two experiments with clear pass or fail bars. It is free, widely used, and takes minutes to complete, so there is no excuse to keep arguing in the abstract.
Test Card
From Strategyzer by Strategyzer (Alexander Osterwalder) one-page worksheet
- It converts a differing assumption into a hypothesis plus a concrete metric and a success threshold, so you both agree in advance on what would change your mind.
- Writing each cofounder's belief on a separate card surfaces exactly where the two of you actually diverge.
- Pair it with the companion Learning Card to record what the test showed, so the decision is documented, not relitigated later.