The New Chance Demonstration, which operated at 16 locations in 10 states in 1989-1992, offered comprehensive education, training, and assistance to teenage mothers who had dropped out of high school. The demonstration, which was designed to increase the young mothers' well-being and long-term self-sufficiency, was subjected to an interim evaluation during which 2,322 women were randomly assigned to either an experimental group (those women allowed to enroll in New Chance) or a control group (those without access to New Chance but with access to alternative services in their communities). Structured interviews were administered to each woman 18 months and again at 42 months after she entered the research sample. The evaluation results were mixed. Many enrollees managed to attain a General Educational Development certificate, used better-quality child care, and demonstrated modestly improved parenting skills; however, New Chance participants also had high rates of repeat pregnancy, their program attendance was sporadic, and more than 80% remained on welfare 18 months after enrolling in New Chance. (Appended are a research group comparison, analysis of survey nonresponse, New Chance site profiles, and characteristics of New Chance enrollees by site. Contains 153 references, a list of 84 selected Manpower Demonstration Research Corporation publications, and 87 tables/figures/boxes.) (MN)