ILO homePublicationsBooks and reports Books and reports May 2012 Publication International Standard Classification of Occupations 2008 (ISCO-08): Structure, group definitions and correspondence tables 10 May 2012 This volume presents the structure and definitions of all groups in the International Standard Classification of Occupations 2008 (ISCO-08) and their correspondence with ISCO-88. January 1991 Publication International standard classification of occupations - (ISCO-88). 1988 edition 08 January 1991