How were the data collected?
The data contained in the UIS Database and Yearbook tables have been collected from some 200 countries. Questionnaires were sent to the UNESCO National Commissions who then passed them on to the relevant national authorities (Ministries of Education, Ministries of Finance, the National Library, and so on). These questionnaires are completed by national experts and then returned to UNESCO. Based on the completed questionnaires, and also taking into consideration other national official data sources, the data were then cross-checked and entered into the UNESCO statistical database.
The 1993 National Survey of College Graduates was conducted by mail with computer-assisted telephone interviewing (CATI) follow-up of all nonrespondents. Nonrespondents to the CATI follow-up were followed up via computer-assisted personal interviewing (CAPI). The 1993 National Survey of Recent College Graduates was conducted almost entirely via CATI, with some mail follow-up for sample members who could not be reached by telephone. The 1993 Survey of Doctorate Recipients was conducted by mail with CATI follow-up of all nonrespondents.
