Design and construction 10,517 Automobiles 4,690 Data processing 4,398 Wireless communication systems 3,753 Computer networks 3,718 Automatic control 3,513 Materials 3,428 Digital techniques 3,330 Computer graphics 3,208 Management 3,173 Programmable controllers 3,043 Testing 2,930 Mathematical models 2,783 Maintenance and repair 2,739 Design 2,702 Signal processing 2,299 Image processing 2,257 Quality control 2,171 Engineering 2,033 Manufacturing processes 2,008 Web sites 2,000 Production management 1,979 Robots 1,947 Electric power systems 1,904 Electronics 1,876 Security measures 1,870 Composite materials 1,823 Safety measures 1,749 Equipment and supplies 1,725 Robotics 1,717