Dewey Decimal Classification
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The Dewey Decimal Classification is a system that organizes library materials by assigning each book a numerical code based on its subject matter, making it easier for people to locate books on library shelves. This organizational method has been widely used in libraries for over a century, helping both librarians and patrons navigate collections efficiently.
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A library bookshelf in Hong Kong classified using the New Classification Scheme for Chinese Libraries, an adaptation of the Dewey Classification scheme
The Dewey Decimal Classification (DDC; /ˈduː.iː/ DOO-ee), colloquially known as the Dewey Decimal System, is a proprietary library classification system which organizes books based on discipline and subject. It was first published in the United States by Melvil Dewey in 1876. Originally described in a 44-page pamphlet, it has been expanded to multiple volumes and revised through 23 major editions, the latest printed in 2011. It is also available in an abridged version suitable for smaller libraries. OCLC, a non-profit cooperative that serves libraries, currently maintains the system and licenses online access to WebDewey, a continuously updated version for catalogers.