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Dewey® Services

Organize your materials with the world's most widely used library classification system.

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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.

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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.

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Get timely updates

Integrate updates to the DDC through continual updates to WebDewey.

"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

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Learn more about organizing your materials with the world's most widely used library classification system.

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

Watch this space for past and recorded Dewey Services events.

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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.

We are a worldwide library cooperative, owned, governed and sustained by members since 1967. Our public purpose is a statement of commitment to each other—that we will work together to improve access to the information held in libraries around the globe, and find ways to reduce costs for libraries through collaboration.