We all have minds of our own. The fact that we all experience our own thoughts, ideas, and imaginings, and that other people can know about them only if we choose to tell them, is taken for granted by most of us. But not by young children, whose understanding of everyday mental states is quite different. Piaget's pivotal work in this area has inspired many psychologists. This volume reports the latest research and theory on this classic and importamt topic - vitally important, since all social behaviour depends on an awareness of others. How and when an accurate knowledge of other minds arises is the central question of this volume.