This volume compiles the conclusions of more than 30 international contributors who each examined the link between personality traits and psychopathology. In light of findings which highlighted the importance of personality in the development and expression of psychopathology, the reference examines several interlocking perspectives: descriptive, developmental, aetiological and therapeutic. It tackles: a description of the frequency and patterns of overlap between personality and psychopathology; the structure and stability of normal personality traits across the lifespan and their relation to psychopathology; an analysis of personality disorders from three different approaches; the causes of individual differences in personality and psychopathology from genetic, psychosocial and neurobiological perspectives; and the role of personality in the treatment of psychopathology.