This edited collection explores issues that arise when researching "hard-to-reach" groups and those who remain socially excluded and marginalized in society, such as access, the use of gatekeepers, ethical dilemmas, "voice," and how such research contributes to issues of inclusion and social justice. The book uses a wide range of empirical and theoretical approaches to examine the difficulties, dilemmas and complexities surrounding research methodologies with particular groups. It emphasizes the importance of national and international perspectives in such discussions, and suggests innovative methodological procedures.