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Cosma arrow.gif communication arrow.gif knowledge arrow.gif form arrow.gif preservation arrow.gif library arrow.gif library classification arrow.gif Dewey Decimal Classification (DDC)
Dewey Decimal Classification : a proprietary system of library classification developed by Melvil Dewey in 1876; it has been greatly modified and expanded through 22 major revisions, the most recent in 2003 -- the system organizes books on library shelves in a specific and repeatable order that makes it easy to find any book and return it to its proper place Wikipedia


Bob the Alien Discovers the Dewey Decimal System (Sandra Donovan, Martin Haake)



library blank.gif book | bibliography | library catalog


library classification blank.gif Dewey Decimal (DDC) | Library of Congress (LC), Subject Heading (LCSH)

see also generalities


How to Understand the Dewey Decimal System (HowCast)

How to Use the Dewey Decimal System

Dewey Decimal Classification summaries (OCLC)

These are links to resources organized by a classification scheme developed exclusively for Cosma. more...


Subject Specific Links

OneLook Free Wiktionary Visuwords


Introduction to Dewey Decimal Classification (Online Computer Library Center

Free Internet Public Library dmoz Commercial Best of the Web

"Dewey+Decimal+Classification" DuckDuckGo

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Melvil Dewey (Wikipedia Article)

Library of Congress

WorldCat (OAIster) Library of Congress UPenn Online Books Open Library Hathi Trust

ISBNdb Google Books eBooks.com Barnes and Noble Amazon eBay Books

"Do We" Really Know Dewey?

Open Education Consortium

025.431: The Dewey blog WordPress

NPR Archives Google News

Google Scholar

Dewey Services (Online Computer Library Center)



True Library Story: Melvil Dewey, The Man Behind the Decimal


Dewey Dewey Decimal Song

The Dewey Decimal Rap

Dewey Browse, Dewey Decimal Made Fun

Can you do the Dewey?


025.431: The Dewey blog
Dewey Decimal Classification DDC - Google News
  • Melvil Dewey's Attempt at a Spelling Revolution - JSTOR Daily Nov 15, 2016
    JSTOR DailyMelvil Dewey's Attempt at a Spelling RevolutionJSTOR DailyMelvil Dewey is famous for the Dewey Decimal system, which most of us were introduced to in high school and public libraries. His Dewey Decimal Classification (DDC) was initially a four-page pamphlet put together in 1876. It's now in its 23rd edition ...
  • Tributes to SR Ranganathan - Daily Excelsior Aug 11, 2016
    Tributes to SR RanganathanDaily ExcelsiorWhile in England, Dr. SR Ranganathan saw that the Dewey Decimal Classification (DDC) was the most popular system in use. His analytical mind quickly discovered its fundamental deficiency and its inability to express all the aspects of a specific ...and more »
  • Neglected Kanga library gets Rs 25 lakh boost from MCA - Mid-Day Jan 25, 2016
    Mid-DayNeglected Kanga library gets Rs 25 lakh boost from MCAMid-DayThe young administrator said the MCA would introduce Dewey Decimal Classification (DDC), a system to help maintain books according to their genre. "There is a vast spectrum of books in every sport. DDC will help in classifying the books by their ...and more »
  • The library of Alexandria goes virtual for online scholarship - eCampus News Sep 29, 2015
    eCampus NewsThe library of Alexandria goes virtual for online scholarshipeCampus NewsCurrently, the library spans multiple DDC (Dewey Decimal Classification) classes that are displayed in either Notecard or tablet format. “Browsing a library with thousands of books becomes extremely difficult if there is no previous knowledge of the ...
  • What a 19th Century 'Googler' Can Tell Us About Today's Obsessive CEOs - Wired Sep 2, 2013
    WiredWhat a 19th Century 'Googler' Can Tell Us About Today's Obsessive CEOsWiredToday the Dewey Decimal Classification (DDC) system, first conceived by Dewey in 1876, organizes library books in nearly 150 countries. However, Dewey's name may not necessarily ring a bell, since for many his system has been replaced by Google.

© Cosma creator mehopper editor mehopper revised 7/15/2016 v.1.5