The Youth in Transition project, a longitudinal study (which began in 1966) of a national sample of young men is described in this report. (Major objectives of the project were (1) to explore Lhe effects of dropping out of high school, (2) to assess the degree to which educational and occupational attainments are predictable from tenth grade measures, (3) to determine the role of educational attainment in occupational attainment, as compared with the role of family background and intellectual ability, and (4) to determine the impacts of various post-high school environments and experiences on values, attitudes, and behaviors.) The results from the fifth and final data collection process and a brief overview of the results of the previous four studies are presented in the introductory chapter. In chapter 2, educational attainment is treated as an outcome variable; also an extensive set of tenth grade measures is examined and the relationships of these measures with later educational attainment are analyzed. Chapters 3 and 4 focus on occupational attainments as outcome measures, with chapter 4 covering the job satisfaction aspect. In chapters 5 through 9, the changes that have occurred between 1966 and 1974 in motives, affective states, values, attitudes, aspirations, and behaviors are examined. The findings of the complete study are summarized in chapter 10. The appendixes contain a glossary providing a brief definition of each variable; various information on sampling and statistics; panel biases; population dropout rate; tabular data for figures; stability coefficients; a matrix on intercorrelations among measures; the 1974 questionnaire; and references. (TA)