Is Your Idea Worth Pursuing?

The most expensive thing you own isn’t your money — it’s your time. “Is my idea worth pursuing?” is the million-or-billion-dollar question, because the wrong answer costs you years you don’t get back.

Most founders answer it one of two ways: they build first and find out eighteen months later that nobody wanted it, or they interview first and walk away with a false positive — a polite “I’d totally use that” that never becomes a sale. There’s a third way that’s now both faster and safer: lay the whole business model on one page and stress-test it before you build or interview.

This runbook walks that stress test. It covers the three approaches and why business-model-first suddenly wins, what a stress test actually is (a fast thought experiment, not a market test), and the four core dimensions every idea has to pass — Clarity, Desirability, Viability, and Feasibility — in the order that matters. You’ll run the Rapid Viability Test to size any idea against your goal in thirty seconds, and learn why a green “can I build it” score is now the most dangerous signal of all.

Every chapter ends with a hands-on exercise — a short thing to run in LEANSpark and a full prompt you can hand to any AI assistant. You don’t make an idea worth pursuing by believing in it harder. You make it worth pursuing by stress-testing the model and betting the riskiest assumption first — before you build.