This volume aims to contribute to the integration of three traditions that have remained separate in psychology. Specifically, the developmental, the psychometric, and the cognitive tradition. In order to achieve this aim, the text deals with these three aspects of human knowing that have been the focus of one or more of the three traditions for many years. Answers are provided to questions such as the following: What is common to intelligence, mind, and reasoning? What is specific to each of these three aspects of human knowing? How does each of them affect the functioning and development of...