ABSTRACT
This chapter addresses definitions and typologies of different forms of aggressive and bullying behaviours. It considers how antisocial behaviour encompasses actions of an aggressive and bullying nature. The deciding criteria concerning when antisocial behaviour might be considered as a disruptive behaviour disorder (DBD) are onset age, frequency, and longevity. Children and teenagers diagnosed with DBD often exhibit a range of problems with overlapping characteristics. Within the category of DBDs two common conditions are recognised: conduct disorder (CD) and oppositional defiant disorder (ODD). Attention deficit hyperactivity disorder (ADHD) was considered as a DBD in version four of the diagnostic statistical manual (DSM-IV-TR) but was moved to 'neurodevelopmental disorders' in version five (DSM-5). This change was administered to reflect the way ADHD is now conceptualised and it will be discussed separately under neurodevelopmental disorders. Neurodevelopmental disorders consist of a collection of conditions characterised by developmental deficits.
