Constructivism is the philosophy that has been cited most frequently in the past 20 years in education. It has been argued that a constructivist philosophy offers a means of education that would result in knowledge generation and creation; therefore, it is superior to other views. Making the shift toward a constructivist philosophy, however, requires a fundamental change in which we need to consider knowledge building communities rather than isolated students (Scardamalia & Bereiter, 1992). The focus of knowledge building communities is on developing a collective knowledge base and enhancing learners' problem-solving skills. This paper presents strategies for using online forums to promote collaborative knowledge building. The approaches presented here apply both to online learning and to blended learning environments. (Contains 1 table.)