Research with human subjects has long been controversial because of the conflicts that often arise between promoting scientific knowledge and protecting the rights and welfare of subjects. Twenty-five years ago the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research addressed these conflicts. The result was the Belmont Report: Ethical Principles and Guidance for Research Involving Human Subjects, a report that identified foundational principles for ethical research with human subjects: respect for persons, beneficence, and justice.Since the publication of Belmont, these three principles have greatly influenced discussions of research with human subjects. While they are often regarded as the single-most influential set of guidelines for biomedical research and practice in the United States (and other parts of the world), not everyone agrees that they provide adequate guidance. Belmont Revisited: Ethical Principles for Research with Human