assumption-testlisted

# Assumption Test This skill runs a riskiest-assumption test on an idea. It decomposes the idea into the leap-of-faith assumptions it silently depends on, classifies each across the four risk lenses — **desirability** (do they want it?), **viability** (does it make us money / fit strategy?), **feasibility** (can we build it?), and **usability** (can they use it?) — then ranks by risk and designs evidence-cheap experiments for the top few. The goal is not to validate the idea. It's to find the assumption that, if false, kills the idea, and test that first for the least money and time. **Grounded in:** *Testing Business Ideas* — David J. Bland & Alex Osterwalder: map desirability/viability/feasibility risks and test the riskiest cheaply. **Go deeper (The Product Channel):** [Learning from Experiments](https://sidsaladi.substack.com/p/week-26-learning-from-experiments) ## When to use this - A new feature, product, or business idea has momentum but no one has named what has to be true for it to work. - You're about to commit engineering or budget to a bet and want to de-risk before building. - A pitch or PRD reads confident but rests on guesses dressed as facts. - Two stakeholders disagree on whether an idea is good — usually they're betting on different assumptions. - A launch underperformed and you want to reconstruct which assumption was actually false. ## Before you start (gather these) - **The idea, stated in one sentence** — what you'd build/launch and for whom. - **The