There has been an increasing attention to integration of project-based learning into Asian school curricula. And the notion of learning community is a heated topic for learning to learn in knowledge-based societies. Yet the cognitive research on using web-based learning community for project-based learning is still under-developed in Asian contexts Based on literature review, some directions in collaborative learning strategies are suggested in web-based learning community or ecology. Through a scrutiny of basic functional tools of a web-based collaborative learning platform called Knowledge Community (KC), the paper endeavors to highlight the significance of four senses of scaffolding supports (in Vygotskian terminology) for knowledge co-construction and pedagogical facilitation in groups of primary and secondary (Grade 1-12) students in Hong Kong and Singapore. Copyright © 2004 全球華人計算機教育應用學會.