I’ve worked in design and with/in startups for 25 years including 4 at IDEO. I’ve used techniques like the book explains, but before reading the book. The book is one of the better ones at introducing the right techniques (especially for SW products). So many startups and big companies ask the wrong questions, the wrong way and get useless answers. If you’re dealing with physical products, services or other things where the interaction with real spaces/things is important, this book might get you started, but others might be better.
