Interest in the ethics of research on human subjects, stimulated by atrocious human experimentation during WWII and the resultant Nuremberg Code, has been sustained by examples of unethical research in many countries and by proliferation of codes and guidelines. Such interest has intensified in recent years in association with expanding international collaborative research endeavors. The ongoing controversy in international research ethics takes place at two levels. At the practical level it is about the competing concerns of those predominantly interested in (...) doing research to advance knowledge and those who, while supporting the need for research, are more acutely aware of the potential to exploit vulnerable participants, especially in developing countries. At the level of theory the controversy pits ethical universalism against moral relativism.In her recent review of agreements and controversies in international research ethics, Ruth Macklin has concluded that, despite seeming agreement on several issues, many different viewpoints persist. In her view it is unlikely that these will be resolved easily. (shrink)