Particular reference is made to change seen as either a discrete or a continuous process. This topic is discussed in relation to progress and modern trends in biology and physics. Additionally discussed is the development of children's understanding of the process of change in physical and biological phenomena. (Author/RH)

Examines the role of social interaction as a facilitator of learning in general and conceptual change in particular. Three conditions are proposed as necessary for social interaction to facilitate knowledge construction--horizontal information, comparable domain knowledge, and availability of cognitive tools. Suggests that these conditions assure…