This novel book approaches the topic of children's agency from a fresh perspective, emphasising what psychological and developmental science can bring to a debate which has been dominated by sociology and anthropology. It reviews research on agency from family, school and wider society domains, pinpointing both strengths and weaknesses and drawing out ways in which theory and practice in relation to children as agents in their own lives might be developed. Combining a psychosocial approach with perspectives from sociology, anthropology and education it offers a stronger theoretical base for research and policy and will be essential reading for students and professionals in these fields.