This article is about experimentation in both practical and mental activity and uses data from a series of studies with preschool children. The article focuses on personal experimentation, which is aimed at discovering relations, rather than the more utilitarian experimentation that is aimed at solving practical tasks. Personal experimentation…

Developing and sustaining quality leadership is imperative for the overall health of our discipline. Part of our responsibility as educators is to think about how best to encourage this ongoing process. This article examines strategies for fostering disciplinary leadership, handing each other along, and being handed along, in various ways. One…

In a mental rotation task, children 5 and 6 years of age and adults had to decide as quickly as possible if a photograph of a hand showed a left or a right limb. The visually presented hands were left and right hands in palm or in back view, presented in four different angles of rotation. Participants had to give their responses with their own…