Children and youth with behaviour disorders are a diverse group that defy a simple description. Generally, they are described by observable behaviours, most often extreme and often viewed as aggressive towards others. However, due to these behaviours, these children tend to demonstrate a variety of related characteristics, such as academic failure, lack of peer and familiar connection, substance abuse, and sometimes resulting interactions with law enforcement. Simply being able to categorise and define this group of students has been an issue of debate for decades, and other issues related to this group of students have also been contentious. Some of these topics such as the conceptual frameworks defining causation and interventions for behaviour disorders and possible placement decisions for students with behaviour disorders will be discussed.