This book analyzes children's agency as interactional achievement in formal and informal contexts of education and illuminates how agency can be encouraged and supported in these educational contexts. Taking a sociological approach, the author deals with children as social agents rather than learners and considers structures of interaction which encourage and support agency, rather than teaching. The book draws from field research conducted over more than twenty years in a variety of Italian and international contexts. This book is unique in providing a theoretical reflection on the social structures that can support children's agency, as well as a large amount of examples which show how these structures and agency work.