Studies of the hierarchical attainment of conservation of physics concepts revealed significant differences with respect to age, sex, and grade level in a random sample of seventh and eighth grade students. Conservation of a quantity did not necessarily depend on the prior conservation of its constituent fundamental quantities. (MLH)

Questions the approach used to the topic of energy in Nuffield Secondary Science. Indicates that 14-year-old children will not be able to generalize from the experiments to see a pattern energing, and the concept of energy involves understanding of other concepts that the children have not yet attained. (GS)

Results of this study suggest that diagrams provide different types of information for ninth-grade students (N=273) and that learners process each type differently. Flow diagrams running across a page from either left to right or right to left, or with or without drawings of dinosaurs, were used. (JN)

Reports on students' study and drawing of five electronic circuit diagrams. Concludes that the success of the students depended upon the amount of detail in the instructional diagrams. (RT)

Reported is the production of an instructional methodology harmonizing with Piagetian theory and enabling teenage students, including those initially mismatched to the task, to understand the mole, as revealed by their performances on a test of basic skills considered fundamental to that concept. (DS)