This study tested certain implied predictions regarding conceptual learning at each of four sequential levels of development: concrete level, identity level, classificatory level, and formal level. For this purpose, scaled batteries to assess the level of conceptual development of children, kindergarten through high school, were constructed and a…

The experiments reviewed in this paper give strong reasons for concluding that the order in which things are learned, the range of exemplification of structural principles, and the introduction of a carefully judged amount of conflict may be critical to reaching an appropriate kind and level of learning. (Author/SJL)