Learning to think: This video illustrates and describes the cognitive abilities of babies and children younger than four. Thinking about the world: This video shows children of different ages being asked questions and presented with Piaget type problems. It demonstrates the emergence of important concepts during childhood. Thinking about thought: This video looks at children's conceptualisation of space and time and the emergence of logical systems in their thinking. Part One -Learning to think: Sensorimotor beginnings and the emergence of symbolic and reflective representation. Part Two- Thinking about the world: The emergence of important concepts during childhood. Part Three - Thinking about thoughts: The conceptualisation of space and the emergence of logical systems. Babies, children and adolescents are observed being posed questions and presented with problems like those invented by Piaget and frequently used by modern researchers.