Effective category-based induction requires understanding that categories include both fundamental similarities between members and important variation. This article explores 4- to 11-year-olds' (n = 207) and adults' (n = 49) intuitions about this balance between within-category homogeneity and variability using a novel induction task in which…

Thirty-four boys and girls between the ages of four and nine were interviewed on their conceptions of positive justice and parental authority and were then reinterviewed one and two years later. Results suggested that stagelike development in children's social reasoning proceeds gradually, with important continuities in children's social cognition…

Concerns the development of children's understanding of representational change and its relation to other cognitive developments. Two experiments involve day care children, aged three, four, and five years. Results suggest that children begin to consider alternative representations of the same object at about age four. (Author/RWB)