This book examines the role of participants in research, and how research ethics can be put into practice. Specifically, the book discusses the ethical regulations and guidance governing researchers in different disciplines, analyses case studies of innovative research projects where ethics have been central to the researcher-subject relationship, assesses the impact of ethics on research methods and approaches, provides useful comparisons of research conducted by professionals and service-users, and offers a unique insight into research participants' perspectives, which are so often absent in discussions of research ethics.