Conjoint Behavioral Consultation (CBC; Sheridan et al., 1996; Sheridan & Kratochwill, 2008) is an indirect intervention that engages parents, teachers, and a behavioral consultant in collaborative, structured problem solving to address shared academic, behavioral, or social-emotional concerns for a student. The goals of CBC are to (a) enhance academic, social-emotional, and behavioral outcomes for children; and (b) develop collaborative family-school partnerships. This study reports the preliminary effects of a study funded by the Institute of Education Sciences to test the effects of CBC on child behavioral outcomes. The specific goals of this study are three-fold. First, the authors present preliminary findings of a randomized trial evaluating the efficacy of CBC on children's externalizing behaviors and social skills assessed by teacher report on standardized measures. Second, they describe the results of an analysis testing the effects of CBC on parent-teacher relationships. Third, to understand the mechanism by which CBC intervention leads to positive child outcomes, they examine the parent-teacher relationship as a mediator between the CBC intervention and child outcomes. Specific research questions are: (1) What is the effect of CBC on children's externalizing, adaptive, and social behaviors?; (2) What is the effect of CBC on teachers' reports of the parent-teacher relationship?; and (3) Does the parent-teacher relationship mediate the effects of CBC on child outcomes? Participants for the current study were 203 Kindergarten through 3rd grade children and their parents and teachers. Preliminary findings showed that, as compared to children in the control group, those who participated in CBC not only experienced reduced externalizing problem behaviors but also demonstrated increased social/adaptive skills at school. Also, as compared to teachers in the control group, those who participated in CBC reported greater improvements in their relationships with parents of children involved in CBC. The mediating effect of parent-teacher relationships was partially supported: Improvement in parent-teacher relationships accounted for the positive CBC effect on children's increased adaptive skills. Investigation continues regarding the pathways by which home-school partnerships contribute to positive CBC outcomes, and results will be presented. (Contains 1 table and 1 figure.)