Human rights are the focus of research and teaching in multiple fields including law, philosophy, political science, sociology, anthropology, economics, psychology, history, literature and public health. Human rights are also the focus of advocacy and on-the-ground investigation by activists affiliated with nongovernmental organisations (NGOs), labour unions and social movements. Scholars interested in rights-based issues thus often face a dual challenge: that of crossing disciplinary boundaries in order to explore human rights questions, and that of bridging the academic-practitioner divide.