Piaget's last two works may add a new level of coherence and generality to his theories, which are grounded in an insight about the interdependence of reality and knowledge about reality. Piaget expanded Kant's epistemology to encompass three systems operating in the frames of biology, psychology, and culture. (MDM)

This article explores relationships between designing and making in the work of children within the age range 5-11 when engaged in practical modelling tasks. The notion of the model is explored from the perspective of concrete representations. It is suggested that concrete models may be used as hypotheses from which to test ideas about the nature…

Piaget's last writings in the 1980s and early 1990s contained both a coherent constructivist account of explanation in science and specific suggestions for revising the logic of operations as a logic of meanings. Demonstrates the interdependence of these two aspects of his work by examining the merits of Piaget's revised logical competence model…

Formal operational ability and interpersonal understanding, possible predictors of adolescent egocentrism, were studied in 87 adolescents from 4 age groups--preadolescents, ages 11-12; young adolescents, ages 13-14; adolescents, ages 16-17; young adults, ages 18-21. Interpersonal understanding level did predict egocentrism as measured by a…

Investigated is the ability of high school pupils and university students to answer questions based on relationships within food webs using sound ecological principles. Research methods used and the results of this study are discussed. (CW)

Attempts to show that not only can density be taught to lower ability pupils but that by doing so, there is the possibility of assisting pupils to develop their reasoning powers. Lists teaching activities that help in this process. (CW)