Book excerpt: This book is a result of a study group that met to discuss the child's theory of mind. A topic whose effects span cognitive, language, and social development, it may bring a unifying influence to developmental psychology. New studies in this area acknowledge children's conceptions of intention and belief, as well as intention and belief themselves, and consider the explanations they provide for children's developing abilities. The contributors to this important volume examine several aspects of the child's theory of mind, and present significant research findings on the theory itself and how it changes and develops for each child. Discussions of the utility of a theory of mind to the child, and to developmental psychologists trying to understand children, are provided. Finally, new explanations are offered for how children acquire a theory of mind in the first place.