System analysis 1,415 System design 443 Signal processing 205 Data processing 187 Mathematical models 139 Electric power systems 80 Management information systems 73 Mathematics 56 Systems engineering 51 Systems analysis 49 Dynamics 47 Control theory 46 Signal theory (Telecommunication) 46 Automatic control 44 MATLAB 44 UML (Computer science) 43 Object-oriented methods (Computer science) 38 Simulation methods 36 Digital techniques 35 Discrete-time systems 31 Engineering 31 Computer software 30 Telecommunication systems 30 Computer architecture 29 Development 29 Linear systems 26 Computer simulation 25 Transformations (Mathematics) 22 Management 21 Object-oriented programming (Computer science) 21