Presents a series of activities intended to enable teachers to determine if children are ready to be introduced to the concept of speed. Reviews Piaget's theories and the empirical evidence on which the sequence is based. (Author/CP)

Demonstrations are presented in which children can be introduced to evidence of specific concepts enabling them to participate in such a way that any conceptual conflicts that might arise in this learning situation can be gradually reduced. (EB)

Outlines the constructivist model of knowledge and describes how this model relates to Piaget's theory of intellectual development. Contrasts the constructivist model with the traditional views of knowledge. Discusses how this model can help explain some of the things that happen in chemistry classrooms. (TW)