The Mindset of Evidence

A founder you know spent four months building a study-group matching app. Before writing code, she did her homework: she pitched the idea to 15 classmates. Twelve said "that's such a good idea, I'd totally use it."

Launch day: she messages all 15. Three download it. One opens it twice. Nobody creates a group.

"But I validated it," she says. "Twelve out of fifteen!"