Between 1970 and 1990, the Dutch working group "Empirical Introduction to Chemistry" developed a secondary school chemistry education curriculum based on the educational vision of the mathematicians van Hiele and van Hiele-Geldof. This approach viewed learning as a process in which students must go through discontinuous level transitions…

The article grapples with the question of how much curriculum change is appropriate in a given context and in a given time frame. How can a balance be struck between stagnation, on the one hand, and the promotion of unrealistic innovation on the other? In answer to this dilemma, the concept of a zone of feasible innovation (ZFI) is proposed and…

Analyzes the meaning of Piaget's concept of abstraction and provides discussion of some of its shortcomings. (HM)

Advocates the educational theories of David Ausubel as a basis on which to build science and mathematics curricula and instructional procedures. Offers interpretations of Piaget's conservation tasks in Ausubelian theory. (CP)

Addresses the question: What criteria can educators use to judge the appropriateness of content and teaching procedures for the particular learners they are responsible for? Discussion includes theory base and a study of students. (SL)

Investigated the development of children's concepts of the earth utilizing the Piagetian interview method to collect data from a sample of 240 children coming from grades four to eight of an experimental public school in Jerusalem, Israel. (HM)