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Dewey Decimal System
Dewey Decimal is a 'Classification System'. This is a special system which helps us locate books about different topics.
The great thing about the Dewey Decimal system is that you can go into any library in the world and still find items based on what area they come under!
The DDC attempts to organize all knowledge into ten main classes. The ten main classes are each further subdivided into ten divisions, and each division into ten sections, giving ten main classes, 100 divisions and 1000 sections. DDC's advantage in using decimals for its categories allows it to be both purely numerical and infinitely hierarchical. It also uses some aspects of a faceted classification scheme, combining elements from different parts of the structure to construct a number representing the subject content (often combining two subject elements with linking numbers and geographical and temporal elements) and form of an item rather than drawing upon a list containing each class and its meaning.
Here is what each part of the Dewey system stands for:
000-009 General Works (encyclopaedias etc)
100-199 Psychology & Philosophy
200-299 Religion & Mythology
300-399 Social Sciences
400-499 Languages
500-599 Natural Science & mathematics
600-699 Applied Science & Technology
700-799 Fine Arts & Recreation
800-899 Literature & Poetry
900-999 Geography & History
Check out Dewy and the Alien http://library.thinkquest.org/5002/Alien/alien.htm