This report charts the rate at which occupational differentiation proceeded among 3,730 young white men and the dimensions along which it proceeded. Data from the National Longitudinal Survey of the Labor Force Experience of Young Men were used to examine employment among men aged sixteen to twenty-eight in different levels and fields of work. Results suggest that the rate of labor force participation stabilizes in the early twenties, differentiation among men by education and the distribution of men among different broad levels and fields of work stabilizes by the mid-twenties, and the sorting of men with different socioeconomic backgrounds into different occupational groups continues through the late twenties, at which age it appears to have been largely completed. Discriminant analyses reveal that academic achievement (IQ and years of education) is the major dimension by which men are sorted or sort themselves to jobs, but socioeconomic background also helps to distinguish among men in different fields as well as levels of work. (Author)