This working paper presents six analyses first reported at the annual convention of the American Psychological Association, August 31, 1968. Most of the individual chapters were written independently. All are, however, concerned with the Youth in Transition Project, a nationwide longitudinal study of adolescent boys. The five chapters presenting findings are all based on the initial cross-sectional data collection. The analyses include: (1) the design and sample for a nationwide longitudinal study of adolescent boys; (2) the development of a summary measure of socio-economic status; (3) intellectual aptitudes and abilities: (a) relationship to selected criteria, and (b) environmental factors and racial differences in test performance; (4) a preliminary investigation of status inconsistency effects; (5) dimensions of adjustment in adolescent boys: Negro-white comparisons; and (6) achievement motivation, grades, and instrumentality. (IM)