This book, the sixth in a series of longitudinal studies initiated by the Youth in Transition Project, examines change and stability and educational and occupational attainments of young men. During the eight year study, nationally representative samples of over 2,000 young men were surveyed and their experiences from 10th grade through five years beyond high school graduation were traced. Objectives were to: (1) explore effects of dropping out of high school by comparing occupational attainments of dropouts with those of graduates, (2) determine the degree to which 10th grade measures can predict educational and occupational attainments, (3) assess the role of educational attainment as compared with the role of family background and intellectual ability, and (4) determine the impacts of post-high school experiences and environments on values, attitudes, and behaviors. The first portion of the book emphasizes factors which precede and/or contribute to educational and occupational attainment. Tenth grade measures of background, ability, educational experiences, occupational outcomes, and job satisfaction are examined. The second portion examines change and stability through a variety of dimensions measured repeatedly from 1966 to 1974. Changes in self-esteem, motives, affective states, values, and views on social issues are analyzed. Results indicate that differences are present before exposure to different environments and experiences; individuals who are initially different tend to seek out different situations. A detailed summary of results and technical information about the research are included. (KC)