The Philadelphia Alliance for Child Trauma Services II (PACTS II): Reaching the MostVulnerable Youth is a behavioral and physical health system-wide trauma universal screening, education, prevention and intervention program, with a focus on the most vulnerable and underserved youth. PACTS II will primarily serve children with Medicaid under the age of 18, but will also include transitional youth ages 18-21 in these populations. PACTS II will serve 500 youth in year 1 and build the served population through year 5, when the center will serve over 1900 youth, for a total of 5,696 children served over the course of the grant. PACTS II goals and objectives include the following. Goal 1: Build the child and adolescent public mental health system's capacity to provide evidenced based trauma treatment to targeted high need youth populations. Objective 1.1 Build the mental health system's trauma treatment and prevention capacity through the implementation of 3 trauma-informed evidence based and promising practices. Objective 1.2 Train and provide implementation support to deliver and sustain the targeted three EBPs. Objective 1.3 Increase the number of youth engaged in and receiving EBPs by 10% annually by increasing the service delivery on the following underserved groups: young children (ages 2-6); LGBTQ youth; CSEC; and IY youth. Goal 2: Increase youth and family participation in and access to universal trauma screening, prevention and intervention services by engaging in outreach and training. Objective 2.1 Train frontline workers (~25% of total) on the impact of trauma on the youth and families they serve, the trauma interventions available, and methods for trauma screening and referral. Objective 2.2 Implement trauma screening at the 3 large Children's Hospital (CHOP) pediatric primary care practices in collaboration with co-located PACTS agencies. Objective 2.3 Increase the number of referrals to PACTS by 25% through increased trauma training and screening.