Riskiest Assumption Test
Every idea rests on assumptions. Some are safe; one or two could sink the whole thing. List them, rate each by impact (how badly being wrong hurts) and uncertainty (how little evidence you have), and test the riskiest one first — before you build.
High impact + high uncertainty = your riskiest assumption. It belongs in the top-right "Test first" quadrant. Validate it with the cheapest experiment you can run.
Impact × Uncertainty
Impact →
Plan for it
Test first
Ignore
Monitor
Uncertainty →
Test order
Recommended Reading
"Testing Business Ideas" by David J. Bland & Alexander Osterwalder→ Check on Amazon
A library of 44 experiments for validating assumptions cheaply — the perfect companion once you've found your riskiest one.
"Running Lean" by Ash Maurya→ Check on Amazon
A systematic process for identifying and de-risking the parts of your business model that are most likely to fail.
"The Lean Startup" by Eric Ries→ Check on Amazon
The build-measure-learn mindset behind testing your riskiest assumptions before scaling.