List of Dewey Decimal classes


The Dewey Decimal Classification 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. 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 within the conceptual framework. The list below presents the ten main classes, hundred divisions, and thousand sections.

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