After completing the course, students could be able to distinguish two subtypes of aggressive behaviour, reactive and proactive aggression, and make a clear assessment on people acting with school bullying, assaults, family violence, blackmail, manslaughter, and homicide. They could be competent to make accurate analyses of the suspects based on the features and characteristics of the crime in particular cases. They could comprehend and apply relevant theories in case analyses as well as the strategies and procedures of handling the suspects. Furthermore, based on Social Information Processing Model, Cognitive-behavioural Therapy, and neurobiological approach, to device effective intervention and counselling strategies for reducing children, adolescents, and adults with reactive and proactive aggression, it leads to reduce the violence, homicide, and crime rate in Hong Kong eventually.