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Originally published in Contemporary Psychology: APA Review of Books, 1969, Vol 14(10), 564. Reviews the book, Epistemologie et Psychologie de la Fonction. (Epistemology: Psychology of Function) by Jean Piaget, Jean-Blaise Frize, Alina Szeminska and, Vinh Bang (1968). As the title suggests, the book is concerned with functions which, for Piaget, are the precursors of concrete operations that appear in early childhood. Like many of the other volumes in the series, the chapters of this book were written by different authors, and some report research, whereas others deal with theory. This book breaks new ground and deserves to be translated for a wider audience. (PsycINFO Database Record (c) 2006 APA, all rights reserved)