5/6/05 9:21 AM Page i The Design of Things e How Ordinary People Create Extraordinary Products 5/6/05 9:21 AM Page ii In the face of accelerating turbulence and change, business leaders and policy makers need new ways of thinking to sustain performance and growth. Wharton School Publishing offers a trusted source for stimulating ideas from thought leaders who provide new mental models to address changes in strategy, management, and finance. We seek out authors from diverse disciplines with a profound understanding of change and its implications. We offer books and tools that help executives respond to the challenge of change. Every book and management tool we publish meets quality standards set by The Wharton School of the University of Pennsylvania. Each title is reviewed by the Wharton School Publishing Editorial Board before being given Wharton’s seal of approval. This ensures that Wharton publications are timely, relevant, important, conceptually sound or empirically based, and implementable. To fit our readers’ learning preferences, Wharton publications are available in multiple formats, including books, audio, and electronic. To find out more about our books and management tools, visit us at and Wharton’s executive education site, . 5/6/05 9:21 AM Page iii The Design of Things e How Ordinary People Create Extraordinary Products Craig M. Vogel Jonathan Cagan Peter Boatwright 5/6/05 9:21 AM Page iv Library of Congress Catalog Number: 2005920661 Publisher: Tim Moore Executive Editor: Jim Boyd Editorial Assistant: Kate E. Stephenson Development Editor: Russ Hall Marketing Manager: Martin Litkowski International Marketing Manager: Tim Galligan Cover Designer: Alan Clements Managing Editor: Gina Kanouse Project Editor: Rose Sweazy Copy Editor: Keith Cline Indexer: Larry Sweazy positor: