This Training Manual aims to provide justice practitioners with an accessible guide to dealing with issues relating to children alleged to have committed terrorism-related offences. It reviews some of the common challenges encountered at different stages of the justice process and offers guidance based on international law, standards and promising practices. It is part of a series of three manuals and is designed to complement the UNODC Handbook Children Recruited and Exploited by Terrorist and Violent Extremist Groups: The Role of the Justice System. The UNODC Handbook provides guidance for a comprehensive approach to the treatment of these children, from prevention to reintegration. Such guidance is anchored in the analysis of the international legal framework, and in the identification of relevant promising practices across different regions of the world.