Teachers and school administrators in Hong Kong have had to cope with more work and performance pressure as they strive to implement educational reforms aimed at deepening students' life-long learning skills. Management systems, which save time and transfer ideas, experiences, and knowledge more efficiently could help schools meet reform goals and relieve the occupational stress that inevitably accompanies change and progress. This paper explores the effect of knowledge management (KM) for school development by reviewing three cases selected from a school improvement project entitled "Knowledge Management and Primary School Development." The project was launched specifically to determine if KM practices can assist educators to cope with added pressures and rise to the challenges of education reforms. The case studies illustrate three separate approaches to incorporating KM systems. Problems faced by these case-schools included declining school competitiveness, time-consuming data storage and retrieval practices, and hierarchical communication structures that stunted feedback from the teachers who are on the front line of educational reform. Interviews were conducted with school principals, middle managers, and teachers. The results show that the core KM strategies of personalization and codification can be adopted to improve school development. Knowledge leadership, knowledge sharing culture, and knowledge management system support were identified as success factors for schools to implement KM.