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During the period in which they are learning to talk, as early as the third year, children not only represent their experience, but reflect on and regulate the way in which they do so. They 'structure the way they structure things'. In this book, originally published in 1983, Susan Sugarman has attempted to observe this process at work on input other than speech sounds and to observe its consequences in behaviour other than language production. She finds that children move quickly beyond the ability to relate one thing to to another, to an ability to conceptualize the interrelationships; a major step in the development of reasoning that was overlooked by theorists of cognitive development prior to the publication of this book. The dawn of reasoning coincides with the dawn of language, but one phenomenon is not reducible to the other; each represents a significant advance toward human rationality.