This report presents findings from the Adolescent Parent Outreach Survey (APOS), a longitudinal survey of mothers under 18 years old in Cook County, Illinois, who were receiving Aid to Families with Dependent Children (AFDC) in October 1981. The report provides a profile of adolescent mothers on AFDC, and identifies personal and family background characteristics associated with the following: (1) completing high school; and (2) having a second birth. Differences in characteristics and social support among Blacks, Whites, and Hispanics are described. Among the findings of the follow-up interviews, conducted in 1983-84, were the following: (1) median age was 19; (2) 20 percent of the mothers had graduated or gotten a General Equivalency Diploma (GED), 8 percent were still in high school, and 72 percent had dropped out; (3) 49 percent had a second child, and another 7 percent were pregnant with their second child; (4) 10 percent had ever been married, and 5 percent were currently married; (5) 25 percent had held a job since their first pregnancy, and 50 percent had ever held a job; (6) 88 percent were still on AFDC; (7) 75 percent said their last pregnancy was unplanned, and 28 percent had been using birth control when they got pregnant last; (8) 68 percent were currently using birth control; (9) Hispanic mothers are much less likely to graduate high school or get a GED than were Black or White mothers; (10) no racial or ethnic differences were found in the likelihood or timing of second births; (11) the primary sources of support for the mothers were their families; (12) very little use of local or organized social services was reported. Data are presented on 33 tables and figures. A list of references is included. Appendices provide the sample design, results of regression analysis of the data, and the survey instrument. (BJV)