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The Dewey Decimal Classification (DDC) is a way of organizing books in a library so that related topics are shelved together. The system identifies each book by its subject in such a way that adding a book to a grouping does not require renumbering books. It is the most widely used library-organizational system in the world and is constantly evolving as content is added.

The Library of Congress Classification (LCC) is a system of organizing books and other materials that was developed by the United States Library of Congress (LOC). The LCC system was initially developed by Herbert Putnam, the librarian of Congress, and Charles Martel, the chief classifier in the LOC's Catalogue Division, to specifically organize the holdings at the LOC.