Comparison of unequal chances in education and changes therein between two generations. Achievements at school / 'doubleren', stay down / advice of teacher / occupation father / education parents / r's present occupation / occupational wishes / sports and hobbies / size of family / description of family situation and housing conditions. Background variables: basic characteristics/ housing situation/ household characteristics/ characteristics of parental family/household/ occupation/employment/ income/capital assets/ education/ religion