PROJECT SUMMARY/ABSTRACT Violence is one of several Adverse Childhood Experiences (ACEs) that can significantly impact children's future physical and behavioral health. Different types of violence against youth, such as child abuse and neglect and community youth violence, often share the same risk and protective factors. Community disadvantage and disorganization are risk factors associated with community trauma and violence, which can be addressed by community-level primary prevention strategies that emphasize community resilience through community organizing. This study will evaluate Prevention Institute's implementation of the Adverse Community Experiences and Resilience (ACE|R) community-level violence prevention framework, responding to Objective 1: Effectiveness research to determine which community- or societal-level strategies effectively prevent multiple forms of violence and other ACEs that impact children and youth. More specifically, it has three aims: (1) retroactively measure the effectiveness of the ACE|R framework implemented in Milwaukee on child abuse and neglect and youth violence using an idiographic clinical trial approach; (2) prospectively test the comparative effectiveness of the ACE|R framework/ Milwaukee Blueprint for Peace with community organizing in four Priority Communities; and (3) use a Hybrid Type 1 effectiveness-implementation design to explore the barriers and facilitators to implementing community organizing within the ACE|R framework in a large metropolitan area (Milwaukee) to inform future implementation efforts by determining strategies to address implementation barriers arising from (a) the intervention characteristics, (b) outer and inner setting factors that shape implementation barriers and facilitators, (c) individual characteristics among stakeholders that influence implementation barriers and facilitators, and (d) strategies that facilitate implementation of community organizing within the ACE|R framework. By addressing several factors associated with community trauma and violence, this framework has the potential to prevent child abuse, child neglect, and youth violence. Findings will expand research evidence for the facilitation of community resilience efforts and contribute valuable insight regarding efficacious, practice-based violence prevention programming.