English language 23 Semiconductors 18 Manufacturing processes 16 Safety measures 15 Welding 13 Digital electronics 11 Study and teaching 10 Listening 9 Public speaking 9 Robotics 9 Robots, Industrial 8 Design and construction 7 Electric welding 7 Fluid power technology 6 Industrial management 6 Maintenance and repair 6 Metal-cutting 6 Production management 6 Business communication 5 Communication 5 Computer-assisted instruction 5 Dies (Metal-working) 5 Engineering 5 Environmental education 5 Hazardous wastes 5 Industrial safety 5 Integrated circuits 5 Plastics 5 Process control 5 Programmable controllers 5