Psychiatric research is of critical importance in improving the care of persons with mental illness. Yet it may also raise difficult ethical issues. This article explores those issues in the context of a particular kind of research: psychosocial intervention research with control groups. We discuss 4 broad categories of ethical issues: consent, confidentiality, boundary violations, and risk-benefit issues. We believe that, despite the potential difficulties, psychosocial intervention research is vital and can be accomplished in an ethical manner. Further discussion and (...) research into these issues are warranted. (shrink)