Rapidly test and validate any startup idea with the 2-day Foundation Sprint (from the creators of the Design Sprint) | Jake Knapp & John Zeratsky (Character Capital)
Lenny Rachitsky
JULY 13, 2025
After decades of working with over 300 startups in the earliest stages, they discovered that most startups fail not because they can’t build, but because they build the wrong thing. The very beginning of a startup is your highest-leverage moment, and most teams waste months or years by skipping a few critical early questions.
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