This book brings together major research findings and theories on the development of children's thinking from infancy to adolescence, and also considers the subsequent practical implications. It examines the processes through which development occurs, as well as the nature of the changes that mark cognitive development in language, perception, memory, conceptual understanding and problem-solving. This new edition includes a chapter on problem-solving, highlights major new theories of cognitive development from Ceci, Halford, Keil, Markman and Wellman and discusses the development of such fundamental concepts as time, space and mind. Major emphasis is placed on infants' attention and perception in the first days of life whilst there is thorough exploration of the relation between brain maturation and cognitive development.