Many measurement systems to monitor the well-being of children and guide services are implemented across the community, state, and national levels in the United States. While great progress has been made in recent years in developing interventions that have been shown to improve the cognitive, affective, and behavioral health of children, many of these tested and effective interventions have yet to be widely implemented. One potential reason for this lag in implementation is a need to further develop and better utilize measures that gauge the success of evidence-based programs as part of a broad effort to prevent negative outcomes and foster children's health and well-being. To address this issue, the Institute of Medicine Forum on Promoting Children's Cognitive, Affective, and Behavioral Health held a workshop in Washington, DC, on November 5-6, 2014. The workshop featured presentations on the use of data linkage and integration to inform research and practice related to children's cognitive, affective, and behavioral health; the use of quality measures to facilitate system change in health care, classroom, and juvenile justice settings; and tools developed to measure implementation of evidence-based prevention programs at scale to support sustainable program delivery, among other topics. Workshop presenters and participants discussed examples of innovative design and utilization of measurement systems, new approaches to build on existing data systems, and new data systems that could support the cognitive, affective, and behavioral health and well-being of children. This report summarizes the presentation and discussions of the event.