To find an answer, you first need to physically go to the library. Then, you need to state your questions in terms the library's systems understand, such as Dewey Decimal System. So, you go to the stacks, pulling out these content units and thumbing through them. If you are lucky, you find what you need. Small wonder few students are known for the depth of their library research.
Librarians can help, of course, but only so much.
They cannot know which parts of which books are relevant. They cannot have the stacks of the library immediately at their fingertips. Learning by exploring environments offer a different vision, one in which the place of research is no longer different than the place of activity. Rather than a passive library, they provide active accessible databases. When students are working through a problem in the classroom, they should be able to immediately access an ASK system, without interrupting what they are doing.