Interactions between conceptual and procedural knowledge influence the development of mathematical competencies. However, after decades of research, these interrelations are still under debate, and empirical results are inconclusive. The authors point out a source of these problems. Different kinds of knowledge and competencies only show up…

This article discusses the results of an earlier experiment which demonstrated a relationship between children's prior understanding of the compensation rule and their tendency to benefit from conservation training. These earlier results are then compared to the results of this experiment which employed different procedures and found no such…

In this study, the effects of three variables hypothesized to influence children's resistance to temptation were assessed in an experiment that independently manipulated the variables. (Author/SB)