TGCT-A is a manualized group or individual treatment program for trauma-exposed or traumatically bereaved older children and adolescents that may be implemented in school, community mental health, clinic, or other service settings. It is a modularized, assessment-driven, flexibly tailored treatment manual and accompanying youth workbook that includes detailed instructions for conducting individual or group sessions. Specific treatment modules (and specific sessions within modules) are selected, prioritized, sequenced, and emphasized based on clients’ specific needs, strengths, circumstances, and informed wishes. The intervention contains a variety of components organized into four modules.