This Synergy issue discusses collaboration between child welfare agencies, the courts, and domestic violence organization. The issue reintroduces the Greenbook Initiative, discusses the provisions in the 2010 Reauthorization of CAPTA related to collaboration, and identifies the need for evidence based research supporting the effectiveness of collaborations. The issue contains interviews of Lonna Davis, who was instrumental in the promotion and application of the Greenbook principles, and Jo Simonsen, the Family Systems Director of the Ohio Domestic Violence Network (ODVN), as well as a list of Resources on collaboration. Finally, the issue closes with an article by the Honorable Judge Rosa (Ret.) on the ACEs study and the effects of trauma on children exposed to domestic violence.