User Innovation Management (UIM) is a method for co-operation with users in innovation projects. The UIM method emphasizes the practice of participatory attitude. This book is a handbook which introduces the UIM method. The book presents: A perspective for understanding user-driven innovation; Three themes for organizing and conducting user-driven innovation; A set of techniques to support user-driven innovation processes. The handbook is written for both practitioners, (innovation managers, product designers and professionals working with design and innovative processes) and graduate and post-graduate students.