Since the end of the sixties, Piagetian general theory with its inherent power of unification has gradually given way to a multitude of more specific models which is in evidence today. In this volume the authors concentrate on three perspectives namely cognitive, perceptuo-motor and neuropsychological development and attempt to coordinate these traditionally separated views. Good illustrations of these theoretical connections can be found in different chapters although the persistent isolation of these three domains still remains. However the authors believe efforts in developmental psychology must continue in the direction of domain interaction, for theoretical concepts as well as methodological tools.

This book is the fruit of a study group on perception and action that worked at the Center for Interdisciplinary Research (ZiP) of the University of Bielefeld, FRG in the academic year 1984-1985. We express our gratitude to the ZiF for hosting the group and for providing fmancial and organizational support for its scientific activities, including a meeting of the authors of the present volume that took place at the ZiF in July 1986. This is/ the study group's last common product, and it took considerable time to give the book its fmal shape. Most of the editing was done while one of us (0. N.) was a Fellow at the Netherlands Institute for Advanced Study in the Humanities and Social Sciences (NlAS) during the academic year 1987-1988. Thanks are due to NIAS for its generous support. We also thank all our friends and colleagues who contributed to the book.