231 Natural sciences
231.2 Biology (Biotechnology), Bioinformatics
231.3 Chemistry
231.5 Mathematics (excluding numerical analysis)
231.7 Physics
232 Physical Sciences, Engineering
232.2 Computer-aided design (CAD)
232.3 Civil
232.4 Electrical, Electronic
232.6 Mechanical
232.7 Manufacturing & Management
233 Social, Behavioral sciences
233.1 Economics
233.2 Education, Computer assisted instruction (CAI)
233.4 Medicine, Health
233.6 Psychology
233.7 Sociology
234 Arts, Humanities
234.1 Arts, Fine arts, Performing arts
234.2 Language translations, Linguistics
234.3 Architecture
234.4 Music
234.5 Law
235 Administrative data processing
235.1 Decision tables
235.2 Financial
235.3 Electronic Mail
235.7 Transportation, Communication (see also 262.36)
235.8 Management systems, Information systems, EDP
235.9 Office automation, Word processing
236 Artificial intelligence, Intelligent agents (See also 258.1)
236.1 Robotics
236.2 Learning, Adaptive systems
236.3 Pattern recognition, Image processing
236.31 Digital, signal processing
236.32 Optical, Vision
236.33 Audio, Speech
236.34 Image compression
236.4 Problem solving, Problem planning
236.5 Simulation of natural systems, Genetic algorithms
236.6 Heuristic methods, Expert systems, Fuzzy systems
236.7 Symbol manipulation
236.8 Knowledge representation, Automated reasoning, Fuzzy Logic
236.9 Natural language understanding, Natural language generation
237 Information retrieval
237.1 Content analysis
237.2 Evaluation of systems, System analysis
237.3 File maintenance
237.4 Searching
237.5 Vocabulary
237.6 Text editing
237.7 Internet, WWW
237.8 Digital libraries
238 Real-time systems
238.2 Industrial process control
239 On-line systems, Applications miscellaneous
239.1 Human-machine interaction, Multimedia, User interfaces, User experience design (UX)
239.2 Computer games
239.3 Groupware, Computer supported cooperative work