The book "The Qfd Book" introduces a method called Quality Function Deployment (QFD) that helps companies improve their business performance by focusing on customer needs. By using teams to identify and solve problems, companies can reduce the time needed to introduce new products and increase customer satisfaction. QFD allows businesses to capture customers' true perceptions and use them to define quality based on what customers actually want. This approach has been successful in Japanese manufacturing and is now accessible to companies worldwide.