Management 178 Maintenance and repair 137 English language 127 Automobiles 114 Computer graphics 93 Mathematics 84 Programming 84 Examinations 75 Computer networks 72 Computer games 71 Design 70 Problems, exercises, etc 67 Textbooks 66 Calculus 58 Computer programs 57 Strategic planning 57 Data processing 55 Digital techniques 55 Economics 52 Marketing 52 Certification 51 Rhetoric 50 Electrical engineering 49 Study and teaching 45 Industrial management 44 C++ (Computer program language) 43 Research 43 Accounting 40 Business enterprises 39 Design and construction 39