The activities and experiences of high school sophomores from 1980 to 1986 are reported in the fourth in a series of descriptive summaries about the 1980 sophomores based on data from the High School and Beyond survey. Detailed information on their educational attainment, work history, marital history, and attitudes and opinions is included. The information includes a diverse collection of classification variables, with analyses organized around differences by race/ethnicity and sex. Four chapters discuss the following: (1) educational experiences: (graduation from high school, enrollment in postsecondary education, and persistence in postsecondary education for 1980 sophomores who entered by 1986); (2) employment experiences (aggregate trends in employment and unemployment and employment experiences of individuals over time); (3) family formation patterns (marital patterns and parenting); and (4) attitudes and opinions (overall trends, patterns of change in attitudes and opinions, self-esteem, and attitudes about sex roles). Among the major findings are that: of the 1982 high school graduates, two-thirds had enrolled in postsecondary education by 1986; and of men and women with similar employment histories, men made higher average hourly wages. Appended are: methodology and technical notes; tables of regression coefficients and adjusted means; data for figures; and means, standard errors, and sample sizes for tables. Twenty-five tables and 18 figures are included. (SM)