Sample-based prospective panel survey
Survey design: Mixed mode (CATI interview & written questionnaire)
Population (1st cohort TREE1): Youth who have completed compulsory school in 2000.
Sample design: stratified sample;
Sample size: valid sample at outset (2001): 6,343;
Panel design: base survey (PISA) in 2000, 10 panel waves conducted in 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2014, 2019/20; further panel waves planned at 5-years intervals.
Field work: Polling institute
Population (2nd cohort TREE2): Youth who have completed compulsory school in 2016.
Sample design: stratified sample;
Sample size: valid sample at outset (2001): 8,429;
Panel design: base survey (ÜGK) in 2016, annual panel waves from 2017 to 2022, further panel waves planned;
Field work: Polling institute
