There is increasing awareness that domestic violence (DV) and child maltreatment often overlap and that there are significant negative consequences to women and children who are victims in the same families. The present study contains data from a participatory evaluation of a multisite national demonstration project on family violence (the "Greenbook" Initiative), funded jointly by the U.S. Departments of Health and Human Services and Justice. The goal of this initiative was to increase community capacity to assist dually victimized families. This article focuses on the DV service organizations in the demonstration with regard to collaborations with other agencies and work within the DV system to respond to dually victimized families. Findings suggest that DV agencies participated in leadership roles, cross-system collaborations, and cross-system trainings throughout the initiative. Within-agency practice changes were less apparent. Research and policy implications are discussed.