Jean Piaget presents in four volumes a selection of the key critical writings on the major themes of Piaget's work. Each volume contains an integral guide to the papers selected and there is a substantial general introduction (Volume 1) and concluding assessment (Volume 4) by the editor.The issues in each volume include contributions dealing with replication, elaboration, application, and evaluation of Piaget's work at both empirical and theoretical levels. The selections have been made with attention to successive dialogues that have been characteristic of the Piagetian critique.