SRI International will examine the Head Start Family and Child Experiences Survey (FACES 2000 cohort) dataset to better understand four sub-groups of Head Start children who are at the highest risk for poor outcomes: (a) children with disabilities and other special needs, (b) children who are English Language Learners, (c) children with health concerns; and (d) children with cumulative environmental risk. Specifically, the proposed data analyses will provide new information on how program and family characteristics predict child outcomes within these subgroups. SRI will use data reduction and multivariate analysis not previously used with this dataset and a growth curve analytic approach to evaluate predictors of child outcomes. The average sample size for each sub-group will be at least 200 Head Start children. Results of the study are expected to aid in the improvement of services for children at the highest risk for poor development and readiness outcomes.