His teaching mainly focuses on research methodology, testing and assessment, and interpersonal psychology. His research interests focus on student learning and achievements, self-esteem and self-concept, bullying and delinquent behaviour, and romantic relationships of young people. He has published over fifty articles in refereed journals or edited books. He has developed the Chinese Adolescent Self-Esteem Scales (CASES) which has been adopted in the Assessment Program for Affective and Social Outcomes (APASO) for Hong Kong students.