Data processing 24 Management 17 Criticism and interpretation 9 History 9 Mathematics 9 Engineering 8 Design and construction 7 History and criticism 7 Marketing 7 Materials 7 International relations 6 Signal processing 6 Strength of materials 6 Accounting 5 Automatic control 5 C (Computer program language) 5 Control theory 5 Digital techniques 5 Mathematical models 5 Production management 5 Structural analysis (Engineering) 5 Air conditioning 4 Comparative government 4 Computer graphics 4 Electronic digital computers 4 Engineering design 4 Engineering graphics 4 Heating 4 Logic circuits 4 Management information systems 4