Electronic digital computers 33 Circuits 31 Design and construction 24 Data processing 10 Logic circuits 10 Design 9 Boundary scan testing 7 Printed circuits 7 Standards 7 Testing 7 Logic design 6 Integrated circuits 5 System design 5 Very large scale integration 5 Logic, Symbolic and mathematical 4 VHDL (Hardware description language) 4 Computer-aided design 3 Mixed signal circuits 3 Algebra, Boolean 2 Set theory 2 Electric circuit analysis 1 Microwave wiring 1 VHDL (Computer hardware description language) 1 design 1