Book excerpt: Agency and Participation in Childhood and Youth presents new critical engagement in conceptualising the roles of youth agency and participation in education, development and the pursuit of social justice. Theoretically, the book is framed within the paradigm of the capability approach, initially developed by Nobel Laureate, Amartya Sen, and further differentiated by others, including philosopher, Martha Nussbaum. The book unravels the complex relationships between the nature of youth agency and participation, in education, but also in wider political, economic and social arenas, and the potential of young people to expand their freedoms to lead lives they have reason to value. It is thus argued that ethical, sustainable development is contingent on the nature of youth agency and participation in schooling and further afield. Bringing together leading international experts researching children's capabilities, Agency and Participation in Childhood and Youth offers a unique exploration of links between exciting new areas of development in theory, research and practical applications of Sen and Nussbaum's ideas. The book addresses a significant gap in the literature drawing on empirical data from the UK, the USA, Jordan, Palestine, the Democratic Republic of the Congo, Switzerland, New Zealand and beyond, with perspectives presented from both within and outside schools and other formal educational settings. Agency and Participation in Childhood and Youth is of particular interest to academics, teaching professionals, undergraduate and postgraduate students of education studies, social policy, youth and development studies.