This Online Learning Center is designed to enhance your learning. Book-specific content like quizzing, cultural activities with Web links, audio, and video can all be accessed by choosing from the list to the left. These materials are designed to help you succeed in your course. Some of these features may be "premium" content. For access to premium content, you will need a registration code. The registration code is included on the card that came with your new textbook. If you have already registered, just enter your username and password when prompted.