The individual’s educational attainment is a core social background variable in standardized surveys. It is usually measured by the highest educational qualification the individual has obtained. However, increasing differentiation of educational systems and migration related to education and work complicate the measurement of educational attainment in surveys considerably. The aim of the project was to develop a tool for measuring educational qualifications that 1) accesses an international database of educational qualifications, 2) provides optimized questionnaire instruments and 3) allows computer-assisted surveys to use the instrument and database. This significantly improved surveying process and data quality.