The purpose of this study is to test the effects on children's social, behavioral, and academic outcomes of an intervention, Families and Schools Together (FAST), when implemented in two novel ways: (a) in schools with predominantly Latino children and (b) on an entire grade-level cohort instead of with individual families targeted for the intervention. The FAST program is a multi-family group prevention program that is implemented in three stages: (a) active outreach to engage parents; (b) an 8-week program of weekly multi-family group meetings; and (c) 2 years of follow-up monthly parent-led meetings. Previous randomized controlled trials have demonstrated positive effects of FAST on reducing child aggression and improving teacher-reported academic outcomes (Abt Associates, 2001; Kratochwill et al., 2004; McDonald et al., 2006). In these studies, children (or, in one case, classrooms) were targeted for the intervention and then matched pairs were randomly assigned to treatment or control. In this study, by contrast, schools were designated by participating school districts in San Antonio, Texas, and Phoenix, Arizona, and then schools were randomly assigned within district to treatment or control, enabling the authors to recruit the entire first-grade cohort of treatment schools for participation in FAST. At this point, results are available only for the first 8 schools (fall administration of Year 1). Consequently, only suggestive findings can be reported, and the authors confine themselves to simple descriptions of treatment-control comparisons rather than the full multilevel models. Full results for the 24 Year-1 schools will be reported in the complete paper. (Contains 2 tables and 1 figure.)