This unit provides a comprehensive overview of the impact of relational and developmental trauma on children's physical, behavioural, and social emotional development. A series of current therapeutic models, assessment tools, examples and practical exercises are presented in this unit to provide students the opportunity to build assessment and counselling skills needed in working with trauma. Vicarious trauma is also considered through evaluating the risks of working with relational and developmental trauma, as well as ways of preventing and mitigating negative consequences for clinicians.