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How it works Dewey decimal system  

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How it works The DDC attempts to organize all knowledge into ten main classes that, excluding the first class (000 Computers, information and general reference), proceed from the divine (philosophy & religion) to the mundane (history & geography). DDC's cleverness is in choosing decimals for its categories; this allows it to be both purely numerical and infinitely hierarchical. It also is a faceted classification, 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. Except for general works and fiction, works are classified principally by subject, with extensions for subject relationships, place, time or type of material, producing classification numbers of not less than three digits but otherwise of indeterminate length with a decimal point before...

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