Organize your materials with the world's most widely used library classification system.
Organize your collection
Libraries big and small the world over use the Dewey Decimal Classification (DDC) system to help make sense of today's complex library collections. The DDC is available in both print and Web formats and in full and abridged editions.
Break down language barriers
The DDC system has been translated into more than 30 languages and serves library users in more than 200,000 libraries in 135+ countries worldwide, making it the world's most widely used library classification system. More than 60 of these countries use the DDC to organize their national bibliographies.
Get timely updates
Integrate updates to the DDC through continual updates to the WebDewey® service.
"The DDC is a quick way to give our patrons a place to start to browse on the shelves and uncover resources not detected through a simple catalog search."
Dennis Brandewie
Oaklyn Branch Library, Evansville Vanderburgh Public Library
The Dewey Decimal Classification (DDC) system is the world’s most widely used way to organize library collections. The DDC constantly updates to enable better discovery across any topic in multiple languages. Because the DDC is easy to use, you can increase the visibility of your materials quickly and efficiently.
Service availability
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Dewey Services
Available everywhere
Learn more
Download the Dewey Services brochure
Download the brochure (US Letter)
Download the brochure (A4)
The Dewey blog is a great source for news and views on classification issues as well as interesting and unusual DDC resources and curiosities. It's also a convenient way to share feedback directly to the DDC editors to help shape the future of the DDC.
Past and recorded events
27 June 2016
Presentations from the ALA Annual 2016 Conference
All copyright rights in the Dewey Decimal Classification system are owned by OCLC. Dewey, Dewey Decimal Classification, DDC, OCLC and WebDewey are registered trademarks of OCLC.