There are 240 million children with disabilities in the world; half of them are out of school. Many are invisible, stigmatized, hidden by their families and abandoned by their governments. Children with disabilities, especially in humanitarian settings, are among the poorest members of the population and one of the most marginalized and excluded groups in society. With only an estimated 1 in 10 children with a need for assistive devices having access, UNICEF's Office of Research -- Innocenti undertook a study to better understand the nature and drivers of Assistive Technology (AT) access in humanitarian settings. This document provides a synthesis of the project's various reports and papers: (1) a thematic literature review summarizes the academic evidence base regarding the provision of AT in humanitarian settings, including the nature and scale of provision and barriers and facilitators of access and provision; and (2) three case studies of countries affected by crisis to triangulate the findings of the literature review and fill identified knowledge gaps with real-world examples: Afghanistan, South Sudan, and the State of Palestine. [For the literature review, see ED620416. For the Afghanistan and South Sudan case studies, see ED620403 and ED620415, respectively.]