Principles of Classification

Have you ever wondered why we have library classification systems and how they work? How does one system organize information compared to another?

This webinar covers basic, general principles of classification, presents the basic structure of the two main systems we use, Library of Congress Classification (LCC) and Dewey Decimal Classification (DDC), and discusses their strengths and weaknesses. It illustrates some of the main differences between LCC and DDC with practical examples.

Who Should Attend

This webinar will be of interest to catalogers and non-catalogers who want a basic introduction to the classification systems and their structure.


Lai Ma is a Ph.D. Candidate and Adjunct Lecturer at the School of Library and Information Science at Indiana University-Bloomington, where she also obtained a M.L.S. Lai has taught courses in the area of knowledge organization for more than four years. Her research interests include the interrelationship between information infrastructure and society.


How to Register

No registration required. Access the session now:

Recording (YouTube)

Recording (.wmv)

Slides (.pdf)

Tech Requirements

Computer with Internet access (high-speed connection is best) and media player software. Headphones recommended.

If you receive a Codec error when playing the recorded file with Windows Media Player, download the gotowebinar codec file from: The Codec acts as a patch that allows the recording, which is created with a higher version of Media Player, to play in version 7. For more information on playing the recording, see the FAQ.




For questions or comments related to the webinars, contact Julie Reese, ALCTS Events Manager at 1-800-545-2433, ext. 5034 or