Examines the role of empirical evidence in the interpretation of psychological and epistemological aspects of Piagetian theory. Concludes that Galileo's method of idealization has important implications for the construction of a neo-Piagetian epistemological theory. Contains 35 references. (Author/WRM)

Presents an investigation of 13- and 14-year-old students' classification skills when they analyze scientific data in science lessons. Finds that less-able students could only classify according to discrete criteria, and that the scientific context influenced students' classification skills. (Contains 18 references.) (Author/WRM)