Six Thinking Hats
Book
Another book by Edward de Bono that Tim Ferriss mentioned as a helpful tool for approaching problems from multiple perspectives.
Mentioned in 2 videos
Videos Mentioning Six Thinking Hats

Rules for Better Thinking, How to Reduce Blind Spots, & More | Shane Parrish | The Tim Ferriss Show
Tim Ferriss
Another book by Edward de Bono that Tim Ferriss mentioned as a helpful tool for approaching problems from multiple perspectives.

Patrick Collison — CEO of Stripe | The Tim Ferriss Show (Podcast)
Tim Ferriss
A book by Edward de Bono that proposes a framework for group discussion and individual thinking involving six distinct perspectives or 'hats.'