We’ve read more than our fair share of books and articles on lean approaches to product validation. And we have to say that The Lean Validation Playbook, by Jon Lay and Zsolt Kocsmarszky of Hanno, is our favorite to date. It’s well written (plus) and to the point (plus). We even learned something new (BIG PLUS): find five people who are in.
The basic premise is that finding five people who are interested in using your proposed solution is a good sign that you’re onto something. There are no guarantees, of course, but it’s a step in the right direction.