Dewey Decimal Classification

The Dewey Decimal Classification is a library system that arranges materials into ten main subject classes and increasingly specific subdivisions using decimal notation.

Dewey Decimal Classes: The ten top-level divisions of Dewey Decimal Classification, numbered from 000 through 900. These classes provide the system’s broad subject framework.
Melvil Dewey: American librarian Melvil Dewey created the classification system first published in 1876. Dewey devised the system and oversaw its early development.
Library of Congress Classification: A library classification system that organizes subjects into alphabetically designated classes and subclasses. Large research libraries may use this alternative rather than Dewey.
Universal Decimal Classification: An international library classification derived from Dewey that uses auxiliary symbols for more complex relationships. It extends Dewey’s decimal foundation with notation for combining subjects and expressing facets.
Dewey Decimal Tables: Schedules of standardized notation that add geographic, linguistic, and other details to Dewey numbers. Tables let a number express details that recur across subject classes.
1876 in library history: The year the first edition of Melvil Dewey’s classification system was published. This publication marks the system’s debut.
Public library: A library serving a community, typically offering collections and services to the general public. Dewey is widely used to arrange nonfiction collections in public libraries.
Colon Classification: A faceted library classification developed by S. R. Ranganathan, using symbols to combine subject facets. Its faceted construction offers a different way to express complex subjects.
Dewey Decimal Relative Index: An alphabetical index that maps topics and terms to locations in the Dewey schedules. The index helps identify a suitable number when a topic’s schedule location is unclear.
Library Bureau: An American company founded in 1876 to supply libraries with equipment, forms, and services. The bureau helped distribute and support the classification system in its early years.

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