New foreword by William Gray, Dean of the School of Education, University of Toledo. Wadsworth's text is highly regarded due to his ability to clarify and summarize many of Piaget's difficult or abstract ideas. A comparison early in the text between the theories of Piaget and Vygotsky clarifies their thinking and differences so that readers can easily identify and incorporate their thinking in instruction. Incorporates practical suggestions for using Piaget's theories in educational settings.