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Even the smartest among us can feel inept as we fail to figure out which light switch or oven burner to turn on, or whether to push, pull, or slide a door. The fault lies in product design that ignore the needs of users and the principles of cognitive psychology. A bestseller in the United States, this bible on the cognitive aspects of design contains examples of both good and bad design and simple rules that designers can use to improve the usability of objects as diverse as cars, computers, doors, and telephones.