Sabina Alkire shows how Nobel Prize-winning economist Amartya Sen's capability approach can be coherently--and practically--put to work in poverty reduction activities. Sen argues that economic development should expand "valuable" freedoms. Alkire probes how we identify what is valuable. Foundational issues are addressed critically--dimensions of development, practical reason, culture, basic needs--drawing on Thomist authors who give central place to authentic participation. A participatory procedure for identifying capability change is then developed. Case studies of three Oxfam activities...