It has been reported that poor psychological health of students is linked to the experience of being bullied by peers. In Hong Kong, there is a paucity of research on this form of social aggression and it is difficult to tackle the problem effectively. This study uses stratified random sampling techniques and a variety of research strategies (e.g. self-report, psychological assessment, questionnaire, interview) to collect data from students, teachers, school heads, and parents. The results will help throw light upon the antecedents, contextual factors, short- and long-term consequences of the problem so that appropriate intervention can be initiated.