Parents love their children, but how well do they understand them? This book is a contribution to making the general public aware that children can be understood if grown-ups do what is required - that is, try to make sense of what children do with their time to change it into experience. What children do varies with their ages. The different tasks of different periods is what we shall explore in this three-part book. The first part focuses on babies, the second part on young children, the third part on adolescents. Insights into each of these stages are expanded in Gattegno's age-specific trilogy The Universe of Babies, Of Boys and Girls, and The Adolescent and His Will.