World Vision and Columbia University, working with Save the Children, UNICEF, and Mercy Corps, undertook a three-year collaborative project to document the outcomes and impacts of CFS and develop capacity for rigorous evaluation. These agencies regularly implement CFS as part of their emergency responses and agreed through this collaboration to support studies of their CFS in various crises when they occurred. Between January 2012 and September 2014, six studies were completed in five countries in Africa and the Middle East. With support from the Research for Health in Humanitarian Crises (R2HC) program, the project expanded its scope in 2012 with the objective to examine the longer-term impact of CFS in three locations – Uganda, Jordan and Nepal. These longitudinal studies examined the trajectory of children’s mental health, well-being, protection and development as well as the sustained impact of CFS on strengthening formal and informal systems essential for children’s support and protection. This technical report summarizes the key learning from each of the longitudinal studies, which were implemented between 2012 and 2016.