How do you develop products that people will actually use and buy? Customer development research is a method for validating your product and company ideas - before you waste months and millions on solving a problem no one needs. Through customer development, you'll learn how your customers behave, what problems they need to solve, and what frustrates and delights them. Through a combination of open-ended interviewing and fast and flexible research techniques, this book provides rich insights that can take you beyond incremental improvements and to the 'a-ha!' moments that inspire truly great products and sustainable businesses.