The purpose of this Funding Opportunity Announcement (FOA) is to encourage research applications to develop and pilot test the effectiveness and implementation of existing family navigator models designed to promote early access, engagement, coordination and optimization of mental health treatment and services for children and adolescents who are experiencing early symptoms of mental health problems. For the purposes of this FOA, NIMH defines a family navigator model as a health care professional or paraprofessional whose role is to deploy a set of strategies designed to rapidly engage youth and families in needed treatment and services, work closely with the family and other involved treatment and service providers to optimize care, and through the use of technology – to monitor the trajectory of mental health symptoms and outcomes over time. Applicants are required to develop and pilot test the navigator model’s ability to promote early access, engagement, coordination and optimization of mental health treatment and services for children and adolescents as soon as symptoms are detected. Applicants are also required to identify and pilot test components of navigator models that drive improvements in mental health care; detect and interrogate tailoring variables that optimize the ‘personalized match’ between the unique mental health needs of youth to the appropriate level of intensity and frequency of mental health services; and utilize emerging novel technologies to track and monitor the trajectory of clinical, functional and behavioral progress toward achieving intended services outcomes.