Dewey Decimal Classification is the most widely used method of classifying books in a library. It is named for Melvil Dewey, who developed it in 1876 (see Dewey, Melvil).
This system classifies books by dividing them into 10 main groups, each represented by figures, as in the table with this article.
Each of these 10 main classes is broken up into more specialized fields. For example, class 600-699, Technology, is subdivided into 10 special classes. Each of these divisions is further subdivided.
Call Number Example:
"Call Number" will denote the Dewey Decimal (DDC) hierarchical structure.
Example:
600 Technology
630 Agriculture and related technologies
636 Animal husbandry
636.7 Dogs
636.8 Cats
* Works of fiction have the call number: FIC
* Works of easy-reader fiction have the call number: E
* Biographies have the call numbers: B, 92 or 920