This chapter describes a background of development and its implications for debriefing children and specifically adolescents, after a traumatic event. It suggests the effectiveness of a delayed intervention, which may perhaps be appropriate because it is provided at a time of greater sense of security for the young person. While children and young people are equally affected by traumatic events, the specific manifestations of their symptomatology occur along a developmental perspective. Post-traumatic stress disorders (PTSD) has been found in children exposed to a wide range of incidents when assessed at varying times ranging from a few days to over a year after the event, using a variety of different assessment measures. Interventions that have reported using group debriefing or have incorporated the core aims and structure of this process have typically been described in relation to transport disasters. The composition of psychological debriefing groups has received minimal attention.