The Four Steps to the Epiphany is an impressively comprehensive methodology for the non-product development activities for startups, covering everything from finding the first customers to building the business. Extremely practical, it recognizes the reality that startups are not simply smaller businesses, that each startup is a different animal. It’s grounded in Lean Thinking, prescribing rapid iteration, testing of the business plan, customer feedback, and eliminating waste. Nothing in the book is abstract theory. The model has led thousands of startups to success. It’s startup gold.