Aids and devices Teaching 719 Study and teaching 145 Educational technology 97 Computer-assisted instruction 52 Design and construction 30 Interactive multimedia 29 Individualized instruction 28 Compact discs in education 24 Vocational education 23 Air conditioning 20 Audio-visual education 18 Electric motors 18 Education 16 Design 14 Electric wiring 14 Multimedia systems 14 Civil engineering 13 Programmable controllers 13 Electric circuits 12 English language 12 Internet in education 12 Automobiles 11 Language and languages 11 Media programs (Education) 11 Technical education 11 Visual education 11 Study and teaching (Higher) 10 Electronics 9 Welding 9