Dialectical Behaviour Therapy (DBT) is a multimodal treatment model developed by Marsha Linehan, an American clinical psychologist, in the early 1980s (Palmer, 2002; Neacsiu, Ward-Ciesielski, & Linehan, 2012; Linehan, 1993a). DBT is based on the principles and strategies of an early treatment known as cognitive-behavioural therapy (CBT) and was originally intended for individuals presenting with suicidal symptoms (Linehan, 1993b). DBT replaced CBT in the treatment of suicidal individuals because the latter’s strategies had failed since most clients responded to treatment by withdrawing or attacking the therapist. Moreover, counselor experienced a variety of difficulties with the use of CBT in treating suicidal clients, especially, the competing priorities concerning the need to decrease suicidality, teaching the clients new behavioral skills, and managing distress among the clients (Neacsiu et al., 2012; Linehan, 1993b). DBT is designed to provide a comprehensive approach to treating suicidal clients, such as people who are suffering from borderline personality disorder (BPD). The treatment is based on theoretical premises and the principles of validation, acceptance, and mindfulness (Feigenbaum, 2007; Swales, 2009; Wix, 2003). Apart from borderline personality disorder (BPD), DBT has also been used in the treatment of anxiety, posttraumatic stress disorder (PTSD), self-destructive behaviors, impulsive behaviors, and alcohol/drug problems (Feigenbaum, 2007). This paper summarizes different aspects of DBT – the major concepts and premises, means of assessment, goal setting, processes, and applicability. The Philosophical Elements of DBT There are three major philosophical elements that underlie DBT including dialectics, Zen Buddhism, and behavioural science (Palmer, 2002; Neacsiu et al., 2012). The basic element of DBT in relation to behavioural science is cognitive-behavioural therapy. DBT is based on the therapeutic techniques of CBT, which emphasize on self-monitoring and collaborative efforts from both the client and the therapist (Palmer, 2002). However, it is important to note that some aspects of CBT are not effective in addressing the problems present among suicidal clients. In order to address the challenges associated with behavioural science approaches such as CBT in the treatment of individuals with BPD, the DBT approach incorporates the principles of Zen. Here, the Zen philosophy encourages people to forego their ideas regarding their view of reality, and focus on the current moment through acceptance, self-validation, and tolerance. From the Zen perspective, the world is perfect as it is and each moment of reality should be accepted without judgment (Robins et al., 2004). This principle is incorporated into the mindfulness component of DBT, which emphasizes on the need for patients to intentionally live in the present moment without judging, rejecting, or getting attached to the moment (Linehan, 1993b). On the other hand, counselors and their BPD clients will recognize that putting acceptance and change together in any treatment session is very difficult. Therefore, DBT incorporates the dialectical element, which emphasizes on th