Operating Systems Operating systems (Computers) 26 Computer Science 23 Computer science 23 Programming Languages, Compilers, Interpreters 6 Programming languages (Electronic computers) 6 Software engineering 6 Software Engineering 5 Algorithm Analysis and Problem Complexity 4 Algorithms 4 Computer Communication Networks 4 Computer networks 4 Computer programming 4 Programming Techniques 4 Management information systems 3 Application software 2 Business 2 Business and Management 2 Computer Applications 2 Computer Hardware 2 Computer System Implementation 2 Computer architecture 2 Computer input-output equipment 2 Computer security 2 Computer system failures 2 Computers 2 Database Management 2 Database management 2 Decision making 2 Information Systems Applications (incl. Internet) 2