Andrea shows a friend how to locate a book called "The Cave" at the library. She searches the library catalog at a computer near the help desk. The catalog provides the book's location, including the floor and call number. It also indicates the book is available. They take the stairs to the third floor where the book is located. Andrea writes down the call number and location from the catalog. By counting shelves, she is able to lead her friend directly to the copy of "The Cave".