1. How is a recommendation engine different from a search engine? 2. Besides e-commerce websites that sell products, what are some other ways that recommendation engines are being used on the Web today? 3. What are some examples of user information required by recommendation engines that use collaborative filtering? 4. Before implementing a content-based recommendation engine, what kind of information would website operators need to collect about their products? 5. What are the four distinct methodologies used by recommender systems to create recommendations? 6. What is a recommendation engine called that combines different methodologies to create recommendations? What are three ways these systems combine methodologies