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. 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.Introduction to the Dewey Decimal Classification (23rd edition) The following list presents the ten main classes, hundred divisions, and thousand sections.Summary lists of Dewey Decimal Classification, 23rd edition (2011)
Class 000 – Computer science, information, and general works 000 Computer science, knowledge, and systems 000 Computer science, information and general works 001 Knowledge 002 The book (writing, libraries, and book-related topics) 003 Systems 004 Data processing and computer science 005 Computer programming, programs, and data 006 Special computer methods (e.g. AI, multimedia, VR) 007–009 [Unassigned] 010 Bibliographies 010 Bibliography 011 Bibliographies 012 Bibliographies of individuals 013 [Unassigned] 014 Bibliographies of anonymous and pseudonymous works 015 Bibliographies of works from specific places 016 Bibliographies of works on specific subjects 017 General subject catalogs 018 Catalogs arranged by author, date, etc. [moved to 017] 019 Dictionary catalogs [moved to 017] 020 Library and information sciences 020 Library and information sciences 021 Library relationships (with archives, information centers, etc.) 022 Administration of physical plant 023 Personnel management 024 [Unassigned] 025 Library operations 026 Libraries for specific subjects 027 General libraries 028 Reading and use of other information media 029 [Unassigned] 030 Encyclopedias and books of facts 030 General encyclopedic works 031 Encyclopedias in American English 032 Encyclopedias in English 033 Encyclopedias in other Germanic languages 034 Encyclopedias in French, Occitan, and Catalan 035 Encyclopedias in Italian, Romanian, and related languages 036 Encyclopedias in Spanish and Portuguese 037 Encyclopedias in Slavic languages 038 Encyclopedias in Scandinavian languages 039 Encyclopedias in other languages 040 Unassigned — formerly Biographies 050 Magazines, journals and serials 050 General serial publications 051 Serials in American English 052 Serials in English 053 Serials in other Germanic languages 054 Serials in French, Occitan, and Catalan 055 Serials in Italian, Romanian, and related languages 056 Serials in Spanish and Portuguese 057 Serials in Slavic languages 058 Serials in Scandinavian languages 059 Serials in other languages 060 Associations, organizations and museums 060 General organizations and museum science 061 Organizations in North America 062 Organizations in British Isles; in England 063 Organizations in central Europe; in Germany 064 Organizations in France and Monaco 065 Organizations in Italy and adjacent islands 066 Organizations in Iberian Peninsula and adjacent islands 067 Organizations in eastern Europe; in Russia 068 Organizations in other geographic areas 069 Museum science 070 News media, journalism, and publishing 070 News media, journalism, and publishing 071 Newspapers in North America 072 Newspapers in British Isles; in England 073 Newspapers in central Europe; in Germany 074 Newspapers in France and Monaco 075 Newspapers in Italy and adjacent islands 076 Newspapers in Iberian peninsula and adjacent islands 077 Newspapers in eastern Europe; in Russia 078 Newspapers in Scandinavia 079 Newspapers in other geographic areas 080 Quotations 080 General collections 081 Collections in American English 082 Collections in English 083 Collections in other Germanic languages 084 Collections in French, Occitan, Catalan 085 Collections in Italian, Romanian, and related languages 086 Collections in Spanish and Portuguese 087 Collections in Slavic languages 088 Collections in Scandinavian languages 089 Collections in other languages 090 Manuscripts and rare books 090 Manuscripts and rare books 091 Manuscripts 092 Block books 093 Incunabula 094 Printed books 095 Books notable for bindings 096 Books notable for illustrations 097 Books notable for ownership or origin 098 Prohibited works, forgeries, and hoaxes 099 Books notable for format
Class 100 – Philosophy and psychology 100 Philosophy 100 Philosophy and psychology 101 Theory of philosophy 102 Miscellany 103 Dictionaries and encyclopedias 104 No longer used — formerly Essays 105 Serial publications 106 Organizations and management 107 Education, research, related topics of philosophy 108 Groups of people 109 History and collected biography 110 Metaphysics 110 Metaphysics 111 Ontology 112 No longer used — formerly Methodology 113 Cosmology (Philosophy of nature) 114 Space 115 Time 116 Change 117 Structure 118 Force and energy 119 Number and quantity 120 Epistemology 120 Epistemology, causation, and humankind 121 Epistemology (theory of knowledge) 122 Causation 123 Determinism and indeterminism 124 Teleology 125 No longer used — formerly Infinity 126 The self 127 The unconscious and the subconscious 128 Humankind 129 Origin and destiny of individual souls 130 Parapsychology and occultism 130 Parapsychology and occultism 131 Parapsychological and occult methods for achieving well-being, happiness, success 132 No longer used — formerly Mental derangements 133 Specific topics in parapsychology and occultism 134 No longer used — formerly Mesmerism and clairvoyance 135 Dreams and mysteries 136 No longer used — formerly Mental characteristics 137 Divinatory graphology 138 Physiognomy 139 Phrenology 140 Philosophical schools of thought 140 Specific philosophical schools and viewpoints 141 Idealism and related systems and doctrines 142 Critical philosophy 143 Bergsonism and intuitionism 144 Humanism and related systems and doctrines 145 Sensationalism 146 Naturalism and related systems and doctrines 147 Pantheism and related systems and doctrines 148 Dogmatism, eclecticism, liberalism, syncretism, and traditionalism 149 Other philosophical systems and doctrines 150 Psychology 150 Psychology 151 No longer used — formerly Intellect 152 Sensory perception, movement, emotions, and physiological drives 153 Conscious mental processes and intelligence 154 Subconscious and altered states and processes 155 Differential and developmental psychology 156 Comparative psychology 157 No longer used — formerly Emotions 158 Applied psychology 159 No longer used — formerly Will 160 Philosophical logic 160 Philosophical logic 161 Induction 162 Deduction 163–164 Not assigned or no longer used 165 Fallacies and sources of error 166 Syllogisms 167 Hypotheses 168 Argument and persuasion 169 Analogy 170 Ethics 170 Ethics (moral philosophy) 171 Ethical systems 172 Political ethics 173 Ethics of family relationships 174 Occupational ethics 175 Ethics of recreation, leisure, public performances, communication 176 Ethics of sex and reproduction 177 Ethics of social relations 178 Ethics of consumption 179 Other ethical norms 180 Ancient, medieval, and Eastern philosophy 180 Ancient, medieval, Eastern philosophy 181 Eastern philosophy 182 Pre-Socratic Greek philosophies 183 Sophistic, Socratic, related Greek philosophies 184 Platonic philosophy 185 Aristotelian philosophy 186 Skeptic and Neoplatonic philosophies 187 Epicurean philosophy 188 Stoic philosophy 189 Medieval Western philosophy 190 Modern Western philosophy (19th-century, 20th-century) 190 Modern Western and other non-eastern philosophy 191 Philosophy of the United States and Canada 192 Philosophy of the British Isles 193 Philosophy of Germany and Austria 194 Philosophy of France 195 Philosophy of Italy 196 Philosophy of Spain and Portugal 197 Philosophy of Russia 198 Philosophy of Scandinavia and Finland 199 Philosophy in other geographic areas
Class 200 – Religion 200 Religion 200 Religion 201 Religious mythology, general classes of religion, interreligious relations and attitudes, social theology 202 Doctrines 203 Public worship and other practices 204 Religious experience, life, practice 205 Religious ethics 206 Leaders and organization 207 Missions and religious education 208 Sources 209 Sects and reform movements 210 Philosophy and theory of religion 210 Philosophy and theory of religion 211 Concepts of God 212 Existence, ways of knowing God, attributes of God 213 Creation 214 Theodicy 215 Science and religion 216 No longer used—formerly Evil 217 No longer used—formerly Prayer 218 Humankind 219 No longer used—formerly Analogies 220 The Bible 220 Bible 221 Old Testament (Tanakh) 222 Historical books of Old Testament 223 Poetic books of Old Testament 224 Prophetic books of Old Testament 225 New Testament 226 Gospels and Acts 227 Epistles 228 Revelation (Apocalypse) 229 Apocrypha, pseudepigrapha, and inter-testamental works 230 Christianity 230 Christianity 231 God 232 Jesus Christ and his family 233 Humankind 234 Salvation and grace 235 Spiritual beings 236 Eschatology 237 No longer used—formerly Future state 238 Creeds, confessions of faith, covenants, and catechisms 239 Apologetics and polemics 240 Christian practice and observance 240 Christian moral and devotional theology 241 Christian ethics 242 Devotional literature 243 Evangelistic writings for individuals and families 244 No longer used—formerly Religious fiction 245 No longer used—formerly Hymnology 246 Use of art in Christianity 247 Church furnishings and related articles 248 Christian experience, practice, life 249 Christian observances in family life 250 Christian orders and local church 250 Local Christian church and Christian religious orders 251 Preaching (Homiletics) 252 Texts of sermons 253 Pastoral office and work (Pastoral theology) 254 Parish administration 255 Religious congregations and orders 256 No longer used — formerly Religious societies 257 No longer used — formerly Parochial schools, libraries, etc. 258 No longer used — formerly Parochial medicine 259 Pastoral care of families, of specific groups of people 260 Social and ecclesiastical theology 260 Christian social and ecclesiastical theology 261 Social theology and interreligious relations and attitudes 262 Ecclesiology 263 Days, times, places of religious observance 264 Public worship 265 Sacraments, other rites and acts 266 Missions 267 Associations for religious work 268 Religious education 269 Spiritual renewal 270 History of Christianity 270 History, geographic treatment, biography of Christianity 271 Religious congregations and orders in church history 272 Persecutions in church history 273 Doctrinal controversies and heresies in general church history 274 Christianity in Europe 275 Christianity in Asia 276 Christianity in Africa 277 Christianity in North America 278 Christianity in South America 279 History of Christianity in other areas 280 Christian denominations 280 Denominations and sects of Christian church 281 Early church and Eastern churches 282 Roman Catholic Church 283 Anglican churches 284 Protestant denominations of continental origin (Lutheran, Continental Reformed) 285 Presbyterian churches, Reformed churches centered in America, Congregational churches 286 Baptist, Restoration Movement, Adventist churches 287 Methodist churches; churches related to Methodism 288 No longer used — formerly Unitarian 289 Other denominations and sects 290 Other religions 290 Other religions 291 No longer used — formerly Comparative religion 292 Classical religion (Greek and Roman religion) 293 Germanic religion 294 Religions of Indic origin 295 Zoroastrianism (Mazdaism, Parseeism) 296 Judaism 297 Islam, Bábism, and Baháʼí Faith 298 No longer used — formerly Mormonism 299 Religions not provided for elsewhere
Class 300 – Social sciences