"Kim’s book is nothing less than a complete handbook for an entire profession. Kim’s unique background in the practice, pedagogy, and epistemology of the design business has given her the experience needed to write the ultimate ‘how-to’ book. Every step in this fascinating and multi-faceted discipline is described in detail in simple, readable prose, richly illustrated with examples taken from real products, real clients, and real design problems. This book is comprehensive in its scope, exhaustive in its depth, authoritative in its practice, and priceless in its wisdom. I’ve no doubt that this will become the most dog-eared, annotated and worn-from-many-readings volume in your library." —Alan Cooper, bestselling author of The Inmates Are Running the Asylum and About Face 3: The Essentials of Interaction Design "Kim is one of the brightest minds in the world of user experience design. Her work on Goal-Directed Design and persona development has set a standard." —Jared Spool, Founding Principal, User Interface Engineering