Dewey Decimal Classification

Dewey Decimal Classification
Name	Dewey Decimal Classification
Caption	Editions of the Dewey Decimal Classification
Introduced	1876
Country	United States
Creator	Melvil Dewey
Classification	Decimal-based
Subject	Libraries

Dewey Decimal Classification is a proprietary library classification system widely used to organize library collections by subject areas, created in the United States in the 19th century and maintained by a non-profit organization. It arranges knowledge into ten main classes and uses decimal notation to allow hierarchical expansion, supporting cataloging practices in public libraries, academic libraries, and school libraries worldwide. The system has influenced bibliographic standards, classification theory, and information retrieval practices across many countries and institutions.

History

Melvil Dewey developed the classification during the post-Civil War era amid movements such as the American Library Association and the World's Columbian Exposition, drawing on contemporaneous figures like Charles Darwin in scientific classification and institutional reforms inspired by Andrew Carnegie philanthropy. Early editions were influenced by printing advances linked to the Gutenberg press legacy and by library innovations at institutions such as Columbia University and the Syracuse University Library, where Dewey worked. The system spread internationally through expositions and professional networks that included organizations like the Library of Congress and the British Library, and it entered national library practices alongside systems like the Universal Decimal Classification and cataloging codes such as the Anglo-American Cataloguing Rules. Over decades, revisions responded to developments represented by events and institutions such as the Industrial Revolution, the United Nations, and the expansion of scholarship at universities like Harvard University and University of Oxford.

Structure and Notation

The scheme organizes knowledge into ten main classes reflecting broad domains, using three-digit numbers for primary classes and decimal extensions for subdivisions, a format paralleling numerical systems such as the Metric system and encoding practices found in the Binary numeral system for hierarchical data. Notation uses Arabic numerals with implicit decimal subdivisions enabling expansion similar to methods employed by standards bodies including the International Organization for Standardization and cataloging practices influenced by the Library of Congress Classification. Notational devices include standard subdivisions and auxiliary tables that interface with bibliographic systems implemented by organizations like OCLC and integrated library systems used by institutions such as the New York Public Library and the British Library.

Classes and Divisions

The ten primary classes encompass areas reflected in collections at institutions like Smithsonian Institution, Metropolitan Museum of Art, and British Museum; specific divisions map to subjects covered by works associated with figures and entities such as Isaac Newton, Marie Curie, William Shakespeare, Sigmund Freud, and Albert Einstein. Subclasses and notation allow linking to specialized literatures produced by publishers and organizations like Oxford University Press, Cambridge University Press, Springer Nature, and research produced at centers such as Massachusetts Institute of Technology and Stanford University. Auxiliary tables permit combining geographic and chronological facets relevant to holdings about regions including United States, United Kingdom, China, India, and France, and topics represented in collections from institutions such as the Library of Congress and the National Library of Canada.

Editions and Revisions

The classification has undergone multiple numbered editions and abridgements, updated by teams affiliated with entities like the Online Computer Library Center and publishers such as OCLC and maintained by governance linked to organizations resembling the American Library Association. Major revisions reflected scholarly trends from periods marked by events such as the World War I and World War II and by disciplinary growth at universities like Princeton University and Yale University. Each edition responded to new literatures coming from research centers including Max Planck Society and CNRS and to cataloging standards influenced by committees akin to those at the International Federation of Library Associations and Institutions.

Use and Implementation

Libraries implement the system in circulation workflows and shelf arrangement practices at institutions like the New York Public Library, Boston Public Library, Toronto Public Library, and university libraries at University of California, Berkeley and University of Toronto. It integrates with cataloging metadata standards and tools from organizations such as OCLC and the Library of Congress, and it appears in training programs at library schools including Simmons University, University of Illinois Urbana-Champaign, and University College London. Implementation considerations involve collection development policies influenced by funders and donors such as Andrew Carnegie and institutional priorities at museums and archives like the Smithsonian Institution and National Archives and Records Administration.

Criticism and Controversies

Critiques have targeted biases and dated terminologies perceived in classifications mirroring social hierarchies examined in studies at universities like Columbia University and University of Chicago, paralleling debates in venues such as the American Library Association conferences. Controversies include disputes over subject representation raised by activists and scholars linked to movements and institutions such as Black Lives Matter, Women’s suffrage movement historians, and LGBTQ+ advocates, with responses produced by library committees and panels similar to those at the International Federation of Library Associations and Institutions and national libraries. Legal and intellectual-property issues have arisen around the system's proprietary status involving publishers and rights discussions comparable to cases in courts addressing copyright law and standards administered by bodies like the United States Copyright Office.

Category:Library classification systems