Many of contemporary society's myriad problems can be traced to aberrant behaviour. Behavioural psychology has been applied to a wide range of problems which include, but are not limited to the following: (a) Anxiety disorders (obsessive-compulsive disorder, panic disorder, post-traumatic stress disorder); (b) Depressive disorders (unipolar depression, dysthymic disorder); (c) Personality disorders (borderline personality disorder); (d) Substance abuse (alcoholism; drug abuse); (e) Health-related problems (sleep disorders, eating disorders, weight control, pain, distress associated with chronic illness); (f) Childhood disorders (conduct disorder, attention deficit and hyperactivity disorder); (g) Pervasive developmental disorders (behavioural problems, language problems, social skill deficits); (h) Violence and aggressive behaviour (criminal behaviour, sex offending); (i) Developmental disabilities (adaptive behaviour, behaviour problems, language difficulties); (j) Academic performance; (k) Relationship problems (sexual dysfunction, marital difficulties); (l) Schizophrenia (skill deficits, psychotic behaviour); (m) Public safety issues (i.e., wearing seat belts). This new book gathers leading research form throughout the world in an effort to gain a better understanding of the problems which plague the world.