Dr. HO Sai-Mun served as secondary school teacher, activities master, prefect of studies, vice principal and principal, participated in voluntary services in different school councils and educational institutes including, the Hong Kong Principals’ Institute (Founding Councilor), Hong Kong Association of Heads of Secondary Schools (Vice-Chairman), Hong Kong Schools Self-Evaluation Network (Chairman), Secondary School Principals Association of Wong Tai Sin District (Chairman), and various special committees in Education Bureau, Hong Kong Examinations and Assessment Authority and Vocational Training Council; in recent years, devoted more time to teaching and research in universities in Hong Kong, Macau and Taiwan, with a commitment to promoting the collaboration and partnership between local and oversea education, universities and schools, integrating theory, research and practice; since early years, has been playing a role in the professional development of educational practitioners, serving as consultant and mentor of training programs of principals in Hong Kong and Mainland, school self-evaluation projects for middle management and teachers in Hong Kong and Macau, self-regulated learning workshops and school based support programs in Mainland, Hong Kong and Taiwan; areas of professional interest: school leadership, school self-evaluation, external evaluation and school improvement, self-regulated learning, adaptive assessment, other learning experiences and student voice.