Structured programming 80 COBOL (Computer program language) 25 Pascal (Computer program language) 10 Programming 10 BASIC (Computer program language) 9 PL/I (Computer program language) 6 Computer programming 5 Electronic digital computers 4 Jackson structured programming 4 FORTRAN 77 (Computer program language) 3 Problem solving 3 Assembler language (Computer program language) 2 Computer software 2 Data processing 2 Data structures (Computer science) 2 Development 2 FORTRAN IV (Computer program language) 2 Microcomputers 2 PL/C (Computer program language) 2 Ada (Computer program language) 1 Algorithms 1 COMAL (Computer program language) 1 Calculus 1 Computer algorithms 1 Computer programs 1 Correctness 1 Debugging in computer science 1 IBM computers 1 Intel 8080 (Microprocessor) 1 Intel 8085 (Microprocessor) 1