The Four Steps to the Epiphany: Successful Strategies for Products that Win
Customer Development for Entrepreneurs: How to Test Startup Ideas and Build Products People Love (Lean Startup Tactics Book 1)
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The Lean Startup by Eric Ries in 2011.
Marty Cagan • INSPIRED: How to Create Tech Products Customers Love (Silicon Valley Product Group)
The Entrepreneur's Guide to Customer Development: A cheat sheet to The Four Steps to the Epiphany
Patrick Vlaskovits • 1 highlight
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