1. Humanities
   1. History
      1. * African history
      2. * American history
      3. * Ancient history
      4. * Argentine history
      5. * Iranian History
      6. * Indian History
      7. * Chinese history
      8. * Diplomatic history
      9. * Ethnohistory
      10. * European history
      11. * History of science and technology
      12. * Military history
      13. * Modern history
      14. * Intellectual history
      15. * Cultural history
      16. * Economic history
      17. * World history
   2. Languages and linguistics
      1. * Applied Linguistics
      2. * Computational linguistics / Natural language processing
      3. * Discourse analysis
      4. * Etymology
      5. * Historical linguistics
      6. * History of linguistics
      7. Topic
      8. * Interlinguistics
      9. * Morphology
      10. Topic
          1. Topic
      11. Topic
      12. * Philology
      13. * Phonetics
      14. * Phonology
      15. * Pragmatics
      16. * Semantics
      17. * Semiotics
      18. * Sociolinguistics
      19. * Syntax
      20. Topic
          1. Topic
      21. Topic
      22. * Composition studies
      23. * Rhetoric
      24. Topic
      25. * Languages
      26. o Classics
      27. o Standard English
      28. o Business English
      29. o World Englishes
      30. o Modern language
   3. Literature
      1. * English literature
         1. o American literature
            1. + African American literature
            2. + Jewish American literature
            3. + Southern literature
         2. o Argentine literature
         3. o Australian literature
         4. o British literature
            1. + English literature
            2. + Scottish literature
            3. + Welsh literature
         5. o Canadian literature
         6. o Indian literature
         7. o Irish literature
         8. o New Zealand literature
         9. o Nigerian literature
         10. o Medieval literature
         11. o Post-colonial literature
         12. o Post-modern literature
      2. * World literatures
         1. o Arabic literature
         2. o Bulgarian literature
         3. o Classics
         4. o Comparative literature
         5. o Chinese literature
         6. o French literature
         7. o Gaelic literature
         8. o German literature and Austrian literature
         9. o Hindi literature
         10. o Hebrew literature
         11. o Japanese literature
         12. o Italian literature
         13. o Latin American literature
         14. o Persian literature
         15. o Portuguese and Brazilian literature
         16. o Russian literature
         17. o Serbian literature
         18. o Spanish literature
         19. o Yiddish literature
         20. o Tamil literature
         21. o Welsh Literature
      3. * Literary theory
         1. o Critical theory
         2. o Literary criticism
         3. o Poetics
         4. o Rhetoric
      4. * Creative writing
         1. o Creative nonfiction
         2. o Fiction writing
         3. o Non-fiction writing
         4. o Literary journalism
         5. o Poetry composition
         6. o Screenwriting
         7. o Playwrighting
   4. Performing Arts
      1. * Arts administration
      2. * Music
         1. o Accompanying
         2. o Chamber music
         3. o Church music
         4. o Musical composition
         5. o Conducting
            1. + Choral conducting
            2. + Orchestral conducting
            3. + Wind ensemble conducting
         6. o Early music
         7. o Jazz studies
         8. o Music education
         9. o Music history
         10. o Music theory
         11. o Musicology
             1. + Ethnomusicology
         12. o Performance and literature
             1. + Organ and historical keyboards
             2. + Piano
             3. + Strings, harp, and guitar
             4. + Voice (Singing)
             5. + Woodwinds, brass, and percussion
         13. o Recording
         14. o Orchestral studies
      3. * Dance
         1. o Choreography
         2. o Dance notation
         3. o Ethnochoreology
         4. o History of dance
      4. * Theatre
         1. o History
         2. o Acting
         3. o Directing
         4. o Design
         5. o Dramaturgy
         6. o Playwrighting
         7. o Scenography
         8. o Musical theatre
      5. * Film
         1. o Animation
         2. o Film
         3. o Film criticism
         4. o Film theory
   5. Philosophy
      1. * Meta-philosophy
      2. * Metaphysics
         1. o Ontology
         2. o Teleology
         3. o Philosophy of mind
            1. + Philosophy of artificial intelligence
            2. + Philosophy of perception
         4. o Philosophy of space and time
         5. o Philosophy of Action
      3. * Epistemology
      4. * Ethics
         1. o Normative ethics
         2. o Meta-ethics
         3. o Theory of value
         4. o Moral psychology
         5. o Applied Ethics
            1. + Animal rights
            2. + Bioethics
            3. + Environmental ethics
      5. * Aesthetics/Philosophy of Art
      6. * Social philosophy and political philosophy
         1. o Feminist philosophy
         2. o Anarchism
         3. o Marxism
      7. * Philosophical traditions and schools
         1. o African philosophy
         2. o Aristotelianism
         3. o Analytic philosophy
         4. o Continental philosophy
         5. o Eastern philosophy
         6. o Feminist philosophy
      8. * History of philosophy
         1. o Ancient philosophy
         2. o Medieval philosophy
         3. o Modern philosophy
         4. o Contemporary philosophy
      9. * Logic
         1. o Philosophical logic
         2. o Mathematical logic
      10. * Applied philosophy
          1. o Philosophy of Artificial Intelligence and Cognitive Science
          2. o Philosophy of education
          3. o Philosophy of history
          4. o Philosophy of religion
          5. o Philosophy of language
          6. o Philosophy of law
          7. o Philosophy of mathematics
          8. o Philosophy of music
          9. o Philosophy of science
             1. + Philosophy of social science
             2. + Philosophy of Physics
             3. + Philosophy of Biology
             4. + Philosophy of Chemistry
             5. + Philosophy of economics
             6. + Philosophy of Psychology
          10. o Philosophy of engineering
          11. o Systems philosophy
   6. Religion
      1. * Abrahamic religions
         1. o Christianity
            1. + Christian Theology
            2. # Bibliology
            3. # Hermeneutics
            4. # Theology Proper
            5. * Christology
            6. * Pneumatology
            7. # Theological anthropology
            8. # Soteriology
            9. # Nomology
            10. # Ecclesiology
            11. # Eschatology
         2. o Islam / Islamic studies
         3. o Judaism / Jewish studies
      2. * Indian religions
         1. o Buddhism
         2. o Hinduism
         3. o Jainism
         4. o Sikhism
      3. * Taoic religions
         1. o Chinese folk religion
         2. o Confucianism
         3. o Shinto
         4. o Taoism
      4. * Other religions
         1. o African religions
         2. o Ancient Egyptian religion
         3. o Native American religions
         4. o Gnosticism
         5. o Esotericism
         6. o New religious movements
         7. o Sumerian religion
         8. o Zoroastrianism
      5. * Atheism and Humanism
      6. * Comparative religion
      7. * Mythology and Folklore
   7. Visual Arts
      1. * Art history
      2. * Calligraphy
      3. * Connoisseurship
      4. * Creative arts
      5. * Drawing
      6. * Fine arts
      7. * Painting
      8. * Photography
      9. * Mixed Media
      10. * Printmaking
      11. * Studio art
      12. * Sculpture
      13. * Art conservation
2. Social Sciences
   1. Antropology
      1. * Biological anthropology
         1. o Forensic anthropology
         2. o Gene-culture coevolution
         3. o Human behavioral ecology
         4. o Human evolution
         5. o Medical anthropology
         6. o Paleoanthropology
         7. o Population genetics
         8. o Primatology
      2. * Anthropological linguistics
         1. o Ethnolinguistics
         2. o Synchronic linguistics (or Descriptive linguistics)
         3. o Diachronic linguistics (or Historical linguistics)
         4. o Sociolinguistics
      3. * Cultural anthropology
         1. o Anthropology of religion
         2. o Economic anthropology
         3. o Ethnography
      4. o Ethnohistory
         1. o Ethnology
         2. o Ethnomusicology
         3. o Folklore
         4. o Mythology
         5. o Political anthropology
         6. o Psychological anthropology
   2. Archaeology
      1. * Classical archaeology
      2. * Egyptology
      3. * Experimental archaeology
      4. * Maritime archaeology
      5. * Near Eastern archaeology
      6. * Paleoanthropology
      7. * Prehistoric archaeology
   3. Area Studies
      1. * American studies
      2. * Appalachian studies
      3. * African studies
      4. * Asian studies
      5. * Celtic studies
      6. * European studies
      7. * German studies
      8. * Indology (Indian studies)
      9. * Iranian studies
      10. * Japanology (Japanese studies)
      11. * Latin American studies
      12. * Sinology (Chinese studies)
      13. * Scandinavian studies
      14. * Slavic studies
   4. Cultural Studies
      1. * Asian studies
      2. * Asian American studies
      3. * Black studies or African American studies
      4. * Chicano studies
      5. * Childhood studies
      6. * Latino studies
      7. * Native American studies
      8. * Persian studies
   5. Economics
      1. * Agricultural economics
      2. * Behavioural economics
      3. * Bioeconomics
      4. * Computational economics
      5. * Consumer economics
      6. * Development economics
      7. * Ecological economics
      8. * Econometrics
      9. * Economic geography
      10. * Economic history
      11. * Economic sociology
      12. * Economic systems
      13. * Energy economics
      14. * Entrepreneurial economics
      15. * Environmental economics
      16. * Evolutionary economics
      17. * Experimental economics
      18. * Feminist economics
      19. * Financial economics
      20. * Game theory
      21. * Green economics
      22. * Growth economics
      23. * Human development theory
      24. * Industrial organization
      25. * Information economics
      26. * Institutional economics
      27. * International economics
      28. * Islamic economics
      29. * Labor economics
      30. * Law and economics
      31. * Macroeconomics
      32. * Managerial economics
      33. * Mathematical economics
      34. * Microeconomics
      35. * Monetary economics
      36. * Neuroeconomics
      37. * Political economy
      38. * Public finance
      39. * Public economics
      40. * Real estate economics
      41. * Resource economics
      42. * Socialist economics
      43. * Socioeconomics
      44. * Transport economics
      45. * Welfare economics
   6. Gender and Sexuality Studies
      1. * Feminine psychology
      2. * Gender studies/Gender theory
      3. * Heterosexism
      4. * Human sexual behavior
      5. * Human sexuality
      6. * Masculine psychology
      7. * Men's studies
      8. * Queer studies/Queer theory
      9. * Sex education
      10. * Sexology
      11. * Women's studies
   7. Geography
      1. * Cartography
      2. * Human geography
         1. * Cultural geography
            1. * Feminist geography
         2. * Economic geography
            1. * Development geography
         3. * Historical geography
            1. * Time geography
         4. * Political geography & geopolitics
            1. * Military geography
            2. * Strategic geography
            3. * Population geography
            4. * Social geography
            5. * Behavioral geography
            6. * Children's geographies
            7. * Health geography
            8. * Tourism geography
            9. * Urban geography
      3. * Environmental geography
      4. * Physical geography
         1. * Biogeography
         2. * Climatology
            1. * Palaeoclimatology
            2. * Coastal geography
            3. * Geomorphology
            4. * Geodesy
            5. * Hydrology/Hydrography
            6. * Glaciology
            7. * Limnology
            8. * Oceanography
            9. * Landscape ecology
            10. * Palaeogeography
      5. * Regional geography
   8. Political Science
      1. * American politics
      2. * Canadian politics
      3. * Civics
      4. * Comparative politics
      5. * Geopolitics (Political geography)
      6. * International relations
      7. * International organizations
      8. * Peace and conflict studies (Science of Peace (Irenology))
      9. * Policy studies
      10. * Political behavior
      11. * Political culture
      12. * Political economy
      13. * Political history
      14. * Political philosophy
      15. * Psephology
      16. * Public administration
          1. o Nonprofit administration
          2. o Non-governmental organization (NGO) administration
      17. * Public policy
   9. Physcology
      1. * Abnormal psychology
      2. * Applied psychology
      3. * Behavioural science
      4. * Biological psychology
      5. * Clinical psychology
         1. o Psychological assessment
         2. o Psychotherapy
            1. + Brief psychotherapy
            2. + Cognitive behavioral therapy
            3. + Family therapy
            4. + Gestalt therapy
            5. + Group therapy
            6. + Play therapy
            7. + Psychodrama
      6. * Cognitive psychology
      7. * Cognitive science
      8. * Community psychology
      9. * Differential psychology
      10. * Developmental psychology
      11. * Educational psychology
      12. * Emotion
      13. * Evolutionary psychology
          1. o Evolutionary developmental psychology
          2. o Evolutionary educational psychology
      14. * Experimental psychology
      15. * Forensic psychology
      16. * Health psychology
      17. * Intrapersonal communications
      18. * Legal psychology (Psychology & Law)
      19. * Medical psychology
      20. * Neuropsychology
      21. * Organizational psychology
      22. * Parapsychology
      23. * Personality psychology
      24. * Positive psychology
      25. * Psychoanalysis
      26. * Psychometrics
      27. * Psychophysics
      28. * Quantitative psychology
      29. * Social psychology
      30. * Sport psychology
      31. * Media psychology
   10. Sociology
       1. * Applied sociology
          1. o Political sociology
          2. o Public sociology
          3. o Social engineering
          4. o Leisure studies
       2. * Collective behavior
          1. o Social movements
       3. * Community informatics
          1. o Social network analysis
       4. * Comparative sociology
       5. * Conflict theory
       6. * Cultural studies
       7. * Criminology/Criminal justice
       8. * Demography/Population
       9. * Environmental sociology
       10. * Feminist sociology
       11. * Future studies
       12. * Human ecology
       13. * Interactionism
           1. o Phenomenology
           2. o Ethnomethodology
           3. o Symbolic interactionism
           4. o Social constructionism
       14. * Medical sociology
       15. * Military sociology
       16. * Organizational studies
       17. * Science studies/Science and technology studies
       18. * Sexology
       19. * Social capital
       20. * Social control
           1. o Pure sociology
       21. * Social economy
       22. * Social philosophy
       23. * Social psychology
       24. * Social policy
       25. * Social research
           1. o Computational sociology
           2. o Economic sociology/Socioeconomics
              1. + Economic development
              2. + Social development
           3. o Sociology of culture
           4. o Sociology of deviance
           5. o Sociology of education
           6. o Sociology of gender
           7. o Sociology of the family
           8. o Sociology of knowledge
           9. o Sociology of law
           10. o Sociology of religion
           11. o Sociology of sport
           12. o Sociology of work
       26. * Social theory
       27. * Social stratification
       28. * Sociological theory
       29. * Sociobiology
       30. * Sociocybernetics
       31. * Sociolinguistics
       32. * Urban studies or Urban sociology/Rural sociology
       33. * Visual sociology
3. Natural Sciences
   1. Space Sciences
      1. * Astrobiology
      2. * Astronomy
         1. o Observational astronomy
            1. + Gamma ray astronomy
            2. + Infrared astronomy
            3. + Microwave astronomy
            4. + Optical astronomy
            5. + Radio astronomy
            6. + UV astronomy
            7. + X-ray astronomy
      3. * Astrophysics
         1. o Gravitational astronomy
            1. + Black holes
         2. o Interstellar medium
         3. o Numerical simulations in
            1. + Astrophysical plasma
            2. + Galaxy formation and evolution
            3. + High-energy astrophysics
            4. + Hydrodynamics
            5. + Magnetohydrodynamics
            6. + Star formation
         4. o Physical cosmology
         5. o Stellar astrophysics
            1. + Helioseismology
            2. + Stellar evolution
            3. + Stellar nucleosynthesis
   2. Earth Sciences
      1. * Edaphology
      2. * Environmental science
      3. * Environmental chemistry
      4. * Gemology
      5. * Geodesy
      6. * Geography
      7. * Geology
      8. * Geochemistry
      9. * Geomorphology
      10. * Geophysics
      11. * Glaciology
      12. * Hydrogeology
      13. * Hydrology
      14. * Meteorology
      15. * Mineralogy
      16. * Oceanography
      17. * Pedology
      18. * Paleontology
          1. o Paleobiology
      19. * Planetary science
      20. * Sedimentology
      21. * Soil science
      22. * Speleology
      23. * Tectonics
   3. Life sciences
      1. * Biochemistry
      2. * Bioinformatics
      3. * Biology
         1. o Aerobiology
         2. o Anatomy
            1. + Comparative anatomy
            2. + Human anatomy
         3. o Botany
            1. + Ethnobotany
            2. + Phycology
         4. o Cell biology
         5. o Chronobiology
         6. o Cryobiology
         7. o Developmental biology
            1. + Embryology
         8. o Ecology
            1. + Human ecology
            2. + Landscape ecology
         9. o Genetics
            1. + Behavioural genetics
         10. o Endocrinology
         11. o Evolutionary biology
         12. o Human biology
         13. o Marine biology
         14. o Microbiology
         15. o Molecular biology
         16. o Nutrition
         17. o Neuroscience
             1. + Behavioral neuroscience
         18. o Paleobiology
             1. + Paleontology
         19. o Virology
             1. + Molecular virology
         20. o Xenobiology
         21. o Zoology
             1. + Animal communications
             2. + Cryptozoology
             3. + Entomology
             4. + Ethology
             5. + Herpetology
             6. + Ichthyology
             7. + Oology
             8. + Ornithology
             9. + Primatology
             10. + Zootomy
      4. * Biophysics
      5. * Limnology
      6. * Linnaean taxonomy
      7. * Mycology
      8. * Parasitology
      9. * Pathology
      10. * Physiology
          1. o Human physiology
             1. + Exercise physiology
      11. * Systematics (Taxonomy)
      12. * Teratology
   4. Chemistry
      1. * Analytical chemistry
      2. * Biochemistry
      3. * Cheminformatics
      4. * Computational chemistry
      5. * Materials science
      6. * Mathematical chemistry
      7. * Quantum chemistry
      8. * Inorganic chemistry
      9. * Organic chemistry
      10. * Physical chemistry
      11. * Theoretical chemistry
      12. * Interface and colloid science
   5. Physics
      1. * Acoustics
      2. * Astrophysics
      3. * Atomic, molecular, and optical physics
      4. * Biophysics
      5. * Theoretical physics
      6. * Computational physics
      7. * Condensed matter physics
      8. * Cryogenics
      9. * Electromagnetism
      10. * Elementary particle physics
      11. * Fluid dynamics
      12. * Geophysics
      13. * Mathematical physics
      14. * Medical physics
      15. * Materials science
      16. * Mechanics
      17. * Molecular physics
      18. * Nuclear physics
      19. * Newtonian dynamics
      20. * Optics
      21. * Plasma physics
      22. * Quantum physics
      23. * Solid state physics
      24. * Solid mechanics
      25. * Statistical mechanics
      26. * Vehicle dynamics
      27. * Thermodynamics
      28. * Applied Physics
4. Formal Sciences
   1. Computer Science
      1. * Theory of computation
         1. o Automata theory (Formal languages)
         2. o Computability theory
         3. o Computational complexity theory
         4. o Concurrency theory
      2. * Algorithms
         1. o Randomized algorithms
         2. o Distributed algorithms
         3. o Parallel algorithms
      3. * Data structures
      4. * Computer architecture
         1. o VLSI design
      5. * Operating systems
      6. * Computer communications (networks)
         1. o Information theory
         2. o Internet, World wide web
         3. o Wireless computing (Mobile computing)
         4. o Ubiquitous computing
         5. o Cloud computing
      7. * Computer security and reliability
         1. o Cryptography
         2. o Fault-tolerant computing
         3. * Distributed computing
         4. o Grid computing
      8. * Parallel computing
         1. o High-performance computing
      9. * Quantum computing
      10. * Computer graphics
          1. o Image processing
          2. o Scientific visualization
          3. o Computational geometry
      11. * Software engineering
          1. o Formal methods (Formal verification)
      12. * Programming languages
          1. o Programming paradigms
             1. + Object-oriented programming
             2. + Functional programming
             3. + Concurrent programming
          2. o Program semantics
          3. o Type theory
          4. o Compilers
      13. * Information science
          1. o Data management
          2. o Data mining
          3. o Database
             1. + Relational database
             2. + Distributed database
             3. + Object database
          4. o Information retrieval
          5. o Information management
          6. o Knowledge management
          7. o Multimedia, hypermedia
      14. * Artificial intelligence
          1. o Cognitive science
             1. + Automated reasoning
             2. + Machine learning
             3. # Artificial neural network
             4. # Support vector machine
             5. + Natural language processing (Computational linguistics)
             6. + Computer vision
          2. o Expert systems
          3. o Robotics
      15. * Information systems (Business informatics)
          1. o Information technology
          2. o Management information systems
          3. o Health informatics
      16. * Human-computer interaction
      17. * Computing in Mathematics, Natural sciences, Engineering and Medicine
          1. o Numerical analysis
          2. o Algebraic (symbolic) computation
          3. o Computational number theory
          4. o Computational mathematics
          5. o Scientific computing (Computational science)
          6. o Computational biology (bioinformatics)
          7. o Computational physics
          8. o Computational chemistry
          9. o Computational neuroscience
          10. o Computer-aided engineering
              1. + Finite element analysis
              2. + Computational fluid dynamics
      18. * Computing in Social sciences, Arts and Humanities, Professions
          1. o Computational economics
          2. o Computational sociology
          3. o Computational finance
          4. o The Digital Humanities (Humanities computing)
      19. * Computer and society
          1. o History of computer hardware
          2. o History of computer science
          3. o Humanistic informatics
          4. o Community informatics
   2. Logic
      1. * Mathematical logic
         1. o Set theory
         2. o Proof theory
         3. o Model theory
         4. o Recursion theory
         5. o Modal logic
         6. o Intuitionistic logic
      2. * Philosophical Logic
         1. o Modal logic
            1. + Deontic logic
            2. + Doxastic logic
         2. o Logical reasoning
      3. * Logic in computer science
         1. o Programming language semantics
         2. o Formal methods (Formal verification)
         3. o Type theory
         4. o Logic programming
         5. o Multi-valued logic
            1. + Fuzzy logic
   3. Mathematics
      1. * Algebra
         1. o Group theory
            1. + Group representation
         2. o Ring theory
         3. o Field theory
         4. o Linear algebra (Vector space)
         5. o Multilinear algebra
         6. o Lie algebra
         7. o Associative algebra
         8. o Non-associative algebra
         9. o Universal algebra
         10. o Homological algebra
         11. o Differential algebra
         12. o Lattice theory (Order theory)
         13. o Representation theory
         14. o K-theory
         15. o Category theory
             1. + Topos theory
      2. * Analysis
         1. o Real analysis
            1. + Calculus
         2. o Complex analysis
         3. o Functional analysis
            1. + Operator theory
         4. o Non-standard analysis
         5. o Harmonic analysis
            1. + Fourier analysis
         6. o p-adic analysis
         7. o Ordinary differential equations
         8. o Partial differential equations
      3. * Probability theory
         1. o Measure theory
         2. o Ergodic theory
         3. o Stochastic process
      4. * Geometry and Topology
         1. o General topology
         2. o Algebraic topology
         3. o Geometric topology
         4. o Differential topology
         5. o Algebraic geometry
         6. o Differential geometry
         7. o Projective geometry
         8. o Affine geometry
         9. o Non-Euclidean geometry
         10. o Convex geometry
         11. o Discrete geometry
      5. * Number theory
         1. o Analytic number theory
         2. o Algebraic number theory
         3. o Geometric number theory
      6. * Logic and Foundations of mathematics
         1. o Set theory
         2. o Proof theory
         3. o Model theory
         4. o Recursion theory
         5. o Modal logic
         6. o Intuitionistic logic
      7. * Applied mathematics
         1. o Statistics
            1. + Mathematical statistics
            2. + Econometrics
            3. + Actuarial science
            4. + Demography
         2. o Approximation theory
         3. o Numerical analysis
         4. o Operations research
            1. + Optimization (Mathematical programming)
            2. + Linear programming
            3. + Dynamic programming
            4. + Assignment problem
            5. + Decision analysis
            6. + Inventory theory
            7. + scheduling
            8. + Real options analysis
            9. + Systems analysis
            10. + Stochastic processes
            11. + Optimal maintenance
         5. o Dynamical systems
            1. + Chaos theory
            2. + Fractal geometry
         6. o Mathematical physics
            1. + Quantum mechanics
            2. + Quantum field theory
            3. + Quantum gravity
            4. # String theory
            5. + Statistical mechanics
         7. o Theory of computation
            1. + Computational complexity theory
         8. o Information theory
         9. o Cryptography
         10. o Combinatorics
             1. + Coding theory
         11. o Graph theory
         12. o Game theory
   4. Statisctics
      1. * Computational statistics
         1. o Data mining
         2. o Regression
         3. o Simulation
            1. + Bootstrap (statistics)
      2. * Design of experiments
         1. o Block design and Analysis of variance
         2. o Response surface methodology
      3. * Statistical modelling
         1. o Biostatistics
            1. + Epidemiology
         2. o Multivariate analysis
            1. + Structural equation model
            2. + Time series
         3. o Reliability theory
         4. o Quality control
      4. * Statistical theory
         1. o Decision theory
         2. o Mathematical statistics
            1. + Probability
      5. * Sample Survey
         1. o Sampling theory
         2. o Survey methodology
   5. System Sciences
      1. * Complex systems
      2. * Cybernetics
      3. * Control theory
         1. o Control engineering
         2. o Control systems
         3. o Dynamical systems
      4. * Operations research
      5. * Systems dynamics
      6. * Systems engineering
         1. o Systems analysis
      7. * Systems theory
         1. o Developmental systems theory
         2. o General systems theory
         3. o Mathematical system theory
5. Applied Science / Professions
   1. Agriculture
      1. * Agroecology
      2. * Agronomy
      3. * Animal husbandry (Animal science)
         1. o Beekeeping (Apiculture)
      4. * Agrology
      5. * Entomology
      6. * Agricultural economics
      7. * Agricultural engineering
         1. o Biological systems engineering
         2. o Food engineering
      8. * Aquaculture
      9. * Enology
      10. * Food science
      11. * Horticulture
      12. * Hydrology
      13. * Plant science
          1. o Pomology
      14. * Viticulture
   2. Architecture
      1. * Architecture and related design
         1. o Architecture
         2. o Urban planning (urban design)
         3. o Interior design (interior architecture)
         4. o Landscape architecture (landscape planning)
      2. * Historic preservation
      3. * Industrial design (product design)
         1. o Ergonomics
         2. o Game design*
         3. o Toy and amusement design*
      4. * Fashion design
      5. * Textile design
      6. * Visual communication
         1. o Graphic design
            1. + Type design
         2. o User interface design
         3. o Technical drawing
   3. Business
      1. * Accounting scholarship
      2. * Business administration
      3. * Business analysis
      4. * Business ethics
      5. * E-Business
      6. * Entrepreneurship
      7. * Finance
      8. * Industrial and labor relations
         1. o Collective bargaining
         2. o Human resources
         3. o Organizational studies
         4. o Labor economics
         5. o Labor history
      9. * Information systems
      10. * Business Law
      11. * International Trade
      12. * Marketing
      13. * Risk management and insurance
      14. * Systems science
      15. * Purchasing
   4. Divinity
      1. * Canon law
      2. * Church history
      3. * Field ministry
         1. o Pastoral counseling
         2. o Pastoral theology
         3. o Religious education techniques
         4. o Homiletics
         5. o Liturgy
         6. o Sacred music
      4. * Scriptural study and languages
         1. o Biblical Hebrew
         2. o Biblical studies/Sacred Scripture
         3. o New Testament Greek
         4. o Latin
         5. o Old Church Slavonic
      5. * Theology
         1. o Dogmatic theology
         2. o Ecclesiology
         3. o Sacramental theology
         4. o Systematic theology
   5. Education
      1. * Consumer education
      2. * Critical pedagogy
      3. * Curriculum and instruction
         1. o Elementary education (Primary education and Intermediate education)
         2. o Secondary education
         3. o Higher education
         4. o Mastery learning
         5. o Cooperative learning
         6. o Agricultural education
         7. o Art education
         8. o Bilingual education
         9. o Chemistry education
         10. o Counselor education
         11. o Language education
         12. o Legal education
         13. o Mathematics education
         14. o Medical education
         15. o Military education and training
         16. o Music education
         17. o Nursing education
         18. o Peace education
         19. o Physical education/ Coaching Education (sport) / Sports coaching
         20. o Physics education
         21. o Reading education
         22. o Religious education
         23. o Science education
         24. o Special education
         25. o Sex education
         26. o Sociology of education
         27. o Technology education
         28. o Vocational education
      4. * Educational leadership
      5. * Educational philosophy
      6. * Educational psychology
      7. * Educational technology
      8. * Distance Education
   6. Engineering
      1. Aerospace Engineering
      2. * Architectural engineering
      3. * Biological engineering
         1. * Agricultural engineering
         2. * Biochemical engineering
         3. * Biomedical engineering
         4. * Biomechanical engineering
         5. * Computer engineering
         6. * Clinical engineering
         7. * Ergonomics
         8. * Food engineering
         9. * Bioprocess engineering
         10. * Bioenergy
         11. * Genetic engineering
         12. * Human genetic engineering
         13. * Metabolic engineering
         14. * Molecular engineering
         15. * Neural engineering
         16. * Protein engineering
         17. * Rehabilitation engineering
         18. * Tissue engineering
      4. * Broadcast engineering
      5. * Building engineering
      6. * Ceramics engineering
      7. * Chemical engineering
         1. * Micro process engineering
         2. * Paper engineering
         3. * Plastics engineering
         4. * Process engineering
      8. * Civil engineering
         1. * Aquatic and environmental engineering
         2. * Architectural engineering
         3. * Climate engineering
         4. * Civionic engineering (civionics)
         5. * Construction engineering
         6. * Earthquake engineering
         7. * Earth systems engineering and management
         8. * Ecological engineering
         9. * Environmental engineering
         10. * Facilities engineering
         11. * Geomatics engineering
         12. * Geotechnical engineering
         13. * Highway engineering
         14. * Hydraulic engineering
         15. * Landscape engineering (landscape architecture)
         16. * Land development engineering
         17. * Pavement engineering
         18. * Railway systems engineering
         19. * River engineering
         20. * Sanitary engineering
         21. * Sewage engineering
         22. * Structural engineering
         23. * Surveying
         24. * Traffic engineering
         25. * Transportation engineering (transport engineering)
         26. * Urban engineering (Municipal engineering)
      9. * Electrical engineering
         1. * Broadcast engineering
         2. * Building engineering
         3. * Communications system engineering
         4. * Computer engineering
         5. * Power System Engineering
         6. * Control engineering (control systems engineering)
         7. * Electronics and Communication Engineering
         8. * Information Technology
         9. * Electronics engineering (includes microelectronics engineering, microelectronics and semiconductor engineering)
         10. * Instrumentation engineering
         11. * Network engineering
      10. * Engineering Science
      11. * Financial engineering
          1. * Computational finance (financial engineering)
          2. * Value engineering
          3. * Cost engineering
      12. * Fire protection engineering
      13. * Glass engineering
      14. * Industrial engineering (includes manufacturing and production engineering)
          1. * Behavioral engineering
          2. * Domain engineering
          3. * Engineering economics
          4. * Engineering management
          5. * Engineering psychology
          6. * Logistic engineering
          7. * Model-driven engineering
          8. * Performance engineering
          9. * Product Family Engineering
          10. * Quality engineering (quality assurance engineering)
          11. * Reliability engineering
          12. * Safety engineering
          13. * Security engineering
          14. * Support engineering
          15. * Systems engineering (systems design engineering)
      15. * Marine engineering
      16. * Materials engineering
          1. * Metallurgical Engineering
          2. * Surface Engineering
          3. * Biomaterials
          4. * Crystal engineering
          5. * Ceramic Engineering
          6. * Plastics engineering
          7. * Forensic materials engineering
          8. * Nanomaterials
          9. * Polymer engineering
          10. * Corrosion engineering
      17. * Mechanical engineering
          1. * Acoustical engineering
          2. * Aerospace engineering
          3. * Audio engineering
          4. * Automotive engineering (automotive systems engineering)
          5. * Earthquake engineering
          6. * Forensic engineering
          7. * Marine engineering
          8. * Mechatronics
          9. * Nanoengineering
          10. * Naval architecture
          11. * Sports engineering
          12. * Structural engineering
          13. * Vacuum engineering
      18. * Military engineer
      19. * Nuclear engineering
      20. * Ocean engineering
      21. * Optical engineering
      22. * Petroleum engineering
          1. * Geophysical engineering
          2. * Mineral engineering
          3. * Mining engineering
          4. * Reservoir engineering
      23. * Planetary engineering / Geoengineering
      24. * Reverse engineering
      25. * Safety engineering
      26. * Software engineering
          1. * Computer-aided engineering
          2. * Cryptographic engineering
          3. * Information engineering
          4. * Knowledge engineering
          5. * Language engineering
          6. * Release engineering
          7. * Teletraffic engineering
          8. * Usability engineering
          9. * Web engineering
      27. * Social engineering
          1. Political engineering
      28. * Systems engineering
      29. * Textile engineering
      30. Subtopic 30
   7. Environmental Sciences and Forestry
      1. * Conservation biology
      2. * Environmental management
         1. o Coastal management
         2. o Fisheries management
         3. o Land management
         4. o Natural resource management
         5. o Wildlife management
      3. * Environmental policy
      4. * Recreation ecology
      5. * Silviculture
      6. * Sustainable development
      7. * Toxicology
   8. Family and Consumer Science
      1. * Consumer education
      2. * Housing*
      3. * Interior design
      4. * Nutrition
         1. o Foodservice management*
      5. * Textiles*
   9. Health Sciences
      1. * Alternative medicine
         1. o Acupuncture
      2. * Clinical laboratory sciences
         1. o Clinical biochemistry
         2. o Cytogenetics
         3. o Cytohematology
         4. o Cytology
         5. o Haemostasiology
         6. o Histology
         7. o Immunology
         8. o Microbiology
         9. o Molecular genetics
         10. o Parasitology
      3. * Dentistry
         1. o Dental hygiene and epidemiology
         2. o Dental surgery
         3. o Endodontics
         4. o Orthodontics
         5. o Oral and maxillofacial surgery
         6. o Periodontics
         7. o Prosthodontics
         8. o Implantology
      4. * Nursing
         1. o Nursing theory
         2. o Midwifery
      5. * Nutrition and dietetics
      6. * Optometry
      7. * Orthoptics
      8. * Physiotherapy
      9. * Occupational therapy
      10. * Speech and language pathology
      11. * Medicine
          1. o Anesthesiology
             1. + Regional anesthesia
             2. + Pain medicine
          2. o Preventive medicine
          3. o Cardiology
          4. o Emergency medicine
             1. + Medical toxicology
          5. o Endocrinology
             1. + Diabetology
          6. o Epidemiology
          7. o Forensic science
          8. o Geriatrics
          9. o Gynaecology
          10. o Hematology
          11. o Infectious disease
          12. o Internal medicine (general medicine)
          13. o Nephrology
          14. o Neurology
          15. o Neurosurgery
          16. o Obstetrics
          17. o Oncology
          18. o Ophthalmology
          19. o Orthopedic surgery
              1. + Hand surgery
              2. + Foot and ankle surgery
              3. + Sports medicine
              4. + Joint replacement
              5. + Shoulder surgery
          20. o Otolaryngology
          21. o Pathology
          22. o Pediatrics
          23. o Podiatry
          24. o Primary care
              1. + General practice
          25. o Public health
          26. o Psychiatry
              1. + Addiction medicine
          27. o Radiology
          28. o Recreation therapy
          29. o Rehabilitation medicine
          30. o Respiratory medicine
              1. + Pulmonology
              2. + Sleep medicine
          31. o Rheumatology
          32. o Sports medicine
          33. o Surgery
              1. + Bariatric surgery
              2. + Cardiothoracic surgery
              3. + Neurosurgery
              4. + Plastic surgery
          34. o Traumatology
          35. o Urology
              1. + Andrology
      12. * Pharmaceutical sciences
      13. * Pharmacy
          1. o Behavioral medicine
          2. o Clinical psychology
          3. o Health psychology
          4. o Medical psychology
          5. o Counseling psychology
      14. * Veterinary medicine
      15. * Physical fitness
          1. o Group Fitness / aerobics
          2. o Personal fitness training
          3. o Kinesiology / Exercise Science / Human Performance
   10. Journalism
       1. * Journalism
          1. o Broadcast journalism
          2. o Literary journalism
          3. o New media journalism
          4. o Print journalism
          5. o Sports journalism / sportscasting
       2. * Media studies (Mass media)
          1. o Newspaper
          2. o Magazine
          3. o Radio
          4. o Television
             1. + Television studies*
          5. o Internet
       3. * Communication
          1. o Animal communications
          2. o Information theory
          3. o Intercultural communication
          4. o Advertising
          5. o Communication design
          6. o Marketing
          7. o Mass communication
          8. o Translation
          9. o Propaganda
          10. o Public relations
          11. o Technical writing
          12. o Nonverbal communications
          13. o Speech communications
   11. Law
       1. * Canon law
       2. * Comparative law
       3. * Constitutional law
       4. * Civil law
          1. o Admiralty law
          2. o Animal law/Animal rights
          3. o Corporations
          4. o Civil procedure
          5. o Contracts
          6. o Environmental law
          7. o International law
          8. o Labor law
          9. o Paralegal studies
          10. o Property law
          11. o Tax law
          12. o Torts
       5. * Criminal law
          1. o Criminal procedure
          2. o Criminal justice
             1. + Police science
             2. + Forensics
       6. * Islamic law
       7. * Jewish law
       8. * Jurisprudence (Philosophy of Law)
   12. Library and Museum Studies
       1. * Archival science
       2. * Bibliometrics
          1. o Citation analysis
       3. * Informatics
       4. * Information architecture
       5. * Museology
          1. o Museum administration
   13. Miltiary Sciences
       1. * Amphibious warfare
       2. * Artillery
       3. * Campaigning
       4. * Military engineering
       5. * Doctrine
       6. * Game theory
       7. * Leadership
       8. * Logistics
       9. * Military history
       10. * Military intelligence
       11. * Military law
       12. * Military medicine
       13. * Naval science
           1. o Naval engineering
           2. o Naval tactics
           3. o Naval architecture
           4. o Weapons systems
       14. * Strategy
       15. * Tactics
           1. o Naval tactics
   14. Public Affairs
       1. * Corrections
       2. * Conservation biology
       3. * Criminal justice
       4. * Emergency management
       5. * Fire safety (Structural fire protection)
       6. * Fire ecology (Wildland fire management)
       7. * Governmental affairs
       8. * International affairs
       9. * Official statistics
       10. * Peace and conflict studies
       11. * Police science
       12. * Public administration
           1. o Nonprofit administration
           2. o Non-governmental organization (NGO) administration
       13. * Public policy
           1. o Education policy
           2. o Environmental policy
           3. o Fiscal policy
           4. o Health policy
           5. o Trade policy
   15. Social Work
       1. * Child welfare
       2. * Community practice
          1. o Community organizing
          2. o Social policy
       3. * Gerontology
       4. * Medical social work
       5. * Mental health
       6. * School social work
   16. Transportation
       1. * Highway safety
       2. * Infographics
       3. * Intermodal transportation studies
       4. * Marine transportation
          1. o Port management
       5. * Operations research
       6. * Mass transit