The research infrastructure UGU stands for "Evaluation Through Follow-up" (translated from swedish) and is the only Swedish research infrastructure in the field of education. UGU is the longitudinal design where individuals from these cohorts are followed through the education system. The design makes it possible to both follow students through the education system and to compare cohorts from different times. The database is a collection of information from surveys and tests. In addition, school administrative data such as school, class, study choices and grades are incorporated in the database.