List of Dewey Decimal classes

The Dewey Decimal Classification (DDC) is structured around ten main classes covering the entire world of knowledge; each main class is further structured into ten hierarchical divisions, each having ten divisions of increasing specificity.[1] As a system of library classification the DDC is "arranged by discipline, not subject", so a topic like clothing is classed based on its disciplinary treatment (psychological influence of clothing at 155.95, customs associated with clothing at 391, and fashion design of clothing at 746.92) within the conceptual framework.[2] The list below presents the ten main classes, hundred divisions, and thousand sections.[3]

Class 000 – Computer science, information and general works[]

Class 100 – Philosophy and psychology[]

Class 200 – Religion[]

Class 300 – Social sciences[]

Class 400 – Language[]

Class 500 – Science[]

Class 600 – Technology[]

Class 700 – Arts and recreation[]

Class 800 – Literature[]

Class 900 – History and geography[]

See also[]


  1. ^ DDC Frequently Asked Questions
  2. ^ Introduction to the Dewey Decimal Classification (23rd ion)
  3. ^ Summary lists of Dewey Decimal Classification, 23rd ion (2011)
  4. ^ "000 Computer science, information, general works" (PDF). OCLC. Retrieved 2022-01-08.

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