Jean Piaget has spent a major part of his life work showing how thought is fundamentally derived from action. In Success and Understanding, this master psychologist inverts the question for the first time and considers how action is controlled by thought.

In a series of ingenious experiments, children are presented with physical puzzles just difficult enough to challenge their emerging skills. Under these conditions, Piaget reveals how the child comes to use his developing conceptual system to design strategies that result in successful actions. According to Piaget, it takes time for thought and action to enter into their familiar partnership. The young child has trouble using his ideas to guide his actions and must pass through several interesting stages before he can routinely coordinate idea and act.

Success and Understanding completes the Piagetian scheme for relating thought to action that was so brilliantly initiated in The Grasp of Consciousness (Harvard, 1976). Together, the two books form a major episode in the history of Piaget's remarkable career.