In dialectical behavior therapy (DBT), dialectics reflect the relative nature of truth, which is subject to change according to the frame of reference. Reality is considered within a systems perspective in which a part of an experience cannot be held separately from the whole of that experience as each invariably shifts in relation to the other. In the biosocial theory of DBT, client's struggles are thought to originate from a combination of biological vulnerability and an invalidating early environment leading to difficulty with emotional vulnerability and emotion regulation. This chapter initially outlines the author's experience in treating clients presenting with trauma exposure. It then describes the key concepts, goals, assessment and intervention of DBT. The chapter finally presents a case study of a client who underwent trauma-focused psychotherapy for significant emotion dysregulation including symptoms of depressed mood, generalized anxiety, insomnia, recurrent flashbacks and nightmares, and repeated self-injurious behaviour.