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"This is the second lecture given at Clark University in honor of the late Heinz Werner, world-famous developmental psychologist. In these two lectures, Professor Piaget raises fundamental questions concerning the nature of memory in the developing child and his response to invariance. In the first, "Memory and Operations", he examines the way in which memory schemata are transformed during the course of the formation of "concrete operations" in early childhood. In the second, "Identity and Conservation", he outlines a developmental sequence of identity responses, starting with simple recognition of persons in infancy and leading up to conservation as an understanding of the invariance of certain quantitative properties or attributes as an object is subjected to particular transformations."
Clark University Press
Piaget, Jean, "On the Development of Memory and Identity" (1967). Heinz Werner Lectures. 19.