Peer research is increasingly used in international academic, policy and practice environments. It engages members of a group or social network as trusted members of a research team working in communities and settings they are familiar with. Critics however point to methodological concerns with peer research. These include the extent to which peer researchers genuinely represent the populations under study; data confidentiality; the emotional burden of enquiring into sensitive issues peers may experience in their own lives; and the reliability and credibility of data collected by people who do not have academic training. The book seeks to counter the marginalisation of research experience and skills derived from close relationships with people and communities, while reflecting critically on the strengths and limitations of peer research. Chapters by a wide range of international contributors illustrate the potential of peer research to facilitate an in-depth understanding of health and social development issues and enhance policy and practice. This broad-based inter-disciplinary book provides students of health, social science and development studies with a thorough grounding in this new style of research. It will appeal to those working in research and evaluation; sexual health and public health; mental health, disability and social care; gender and sexuality; conservation and environmental management; migration and citizenship studies; and humanitarian and international development.