Mentalizing - the ability to understand oneself and others by inferring mental states that lie behind overt behaviour - develops within the context of attachment relationships. It is crucial to self-regulation and constructive, intimate relationships, both of which are impaired in personality disorders because of sensitivity to losing mentalizing at times of anxiety and attachment stress. Loss of mentalizing leads to interpersonal and social problems, emotional variability, impulsivity, self-destructive behaviours, and violence.This practical guide on mentalization-based treatment (MBT) of personality disorders outlines the mentalizing model of borderline and antisocial personality disorders and how it translates into clinical treatment. The book, divided into four parts - the mentalizing framework, basic mentalizing practice, mentalizing and groups, and mentalizing systems - covers the aims and structure of treatment, outlines how patients are introduced to the mentalizing model so th