Certification 129 Computer technicians 129 Electronic data processing personnel 111 Examinations 100 Maintenance and repair 66 Microcomputers 62 Study guides 41 Computer networks 23 Computing Technology Industry Association 16 Computer security 13 Security measures 13 Microsoft software 8 Computer software 5 Computer input-output equipment 4 Computers 4 Microsoft Windows (Computer file) 4 Telecommunications engineers 4 Operating systems (Computers) 3 Problems, exercises, etc 1