Melvil Dewey 1873 classified the Writings and books in to ten main classes as the name suggests decimal classification. This classification help us to arrange the books in library and search a book from library. This classification is as follows:
- 000 : Computer, Information technology.
- 100 : Philosophy, Psychology.
- 200 : Religion.
- 300 : Social sciences.
- 400 : Language.
- 500 : Science.
- 600 : Technology.
- 700 : Arts and Recreation.
- 800 : Literature.
- 900 : History and Geography.
First figure shows main category, Second shows sub category and third figure shows the sub sub category after three figures point is used after point next figure show further sub category and so on like:
- 800 : Literature
- 810 : Poetry
- 811 : Sonnets
- 811.1 : Shakespearean sonnets
So 811.1 means it is a book of literature sub category is poetry, sub sub category is sonnets and sub sub sub category is Shakespearean sonnets.