Data processing 56 Mathematical models 44 Design and construction 40 Mathematics 38 Research 34 Law and legislation 29 Environmental aspects 26 Philosophy 26 Signal processing 25 Integrated circuits 24 Management 24 Economic aspects 22 History 20 Law 19 Materials 19 Very large scale integration 17 Climatic changes 16 Methodology 16 Wireless communication systems 15 Artificial intelligence 14 Design 14 Information technology 14 Social aspects 14 Digital techniques 13 Economics 13 Electronic commerce 13 Finance 13 Study and teaching 13 Computer networks 12 Electronic circuit design 12