Certification 10 Electronic data processing personnel 8 Examinations 8 Civil service 6 Computer networks 5 Internetworking (Telecommunication) 5 English language 4 Telecommunications engineers 4 Competency based educational tests 3 Employees 3 Rating of 3 Air conditioning 2 Automobiles 2 Buses 2 Heating and ventilation 2 International English Language Testing System 2 Internet telephony 2 Maintenance and repair 2 Management 2 Mechanics (Persons) 2 Microsoft Windows (Computer file) 2 Microsoft software 2 National teacher examinations 2 Personnel management 2 Public service commissions 2 Software configuration management 2 Study guide 2 Switching systems 2 Teachers 2 Teaching 2