Do libraries just throw books on the shelf?

Libraries have two options with how to organize the mass collection of books they offer. They can use the Dewey Decimal System of classification or the Library of Congress Classification System. When the aisles and books are organized with a series of numbers, then this is the first indication that they use the Dewey Decimal System of classification. Few libraries use this system because of the limitations. This system has fewer categories and cannot provide as many subcategories, maximum 99, as the Library of Congress Classification System. The majority of libraries use the Library of Congress Classification System because of its expansion abilities, hundreds of subcategories, and it’s more detailed categories. This system does have some faults. It contains quite a few ethnocentric characteristics, such as 2 categories of history that can contain the United States history versus on category for the rest of the world. The organization by alphabetic letter often does not correspond with the title when it could have; this creates some confusion when assumptions are made.