From our examination of the relation of behavioral science research to the right to privacy, we have been led to the following conclusions. 1) While most current practices in the field pose no significant threat to the privacy of research subjects, a sufficient number of exceptions have been noted to warrant a sharp increase in attention to procedures that will assure protection of this right. The increasing scale of behavioral research is itself an additional reason for focusing attention in this area. 2) Participation by subjects must be voluntary and based on informed consent to the extent that this is consistent with the objectives of the research. It is fully consistent with the protection of privacy that, in the absence of full information, consent be based on trust in the qualified investigator and the integrity of his institution. 3) The scientist has an obligation to insure that no permanent physical or psychological harm will ensue from the research procedures, and that temporary discomfort or loss of privacy will be remedied in an appropriate way during the course of the research or at its completion. To merit trust, the scientist must design his research with a view to protecting, to the fullest extent possible, the privacy of the subjects. If intrusion on privacy proves essential to the research, he should not proceed with his proposed experiment until he and his colleagues have considered all of the relevant facts and he has determined, with support from them, that the benefits outweigh the costs. 4) The scientist has the same responsibility to protect the privacy of the individual in published reports and in research records that he has in the conduct of the research itself. 5) The primary responsibility for the use of ethical procedures must rest with the individual investigator, but government agencies that support behavioral research should satisfy themselves that the institution which employs the investigator has effectively accepted its responsibility to require that he meet proper ethical standards. 6) Legislation to assure appropriate recognition of the rights of human subjects is neither necessary nor desirable if the scientists and sponsoring institutions fully discharge their responsibilities in accommodating to the claim of privacy. Because of its relative inflexibility, legislation cannot meet the challenge of the subtle and sensitive conflict of values under consideration, nor can it aid in the wise decision making by individuals which is required to assure optimum protection of subjects, together with the fullest effectiveness of research.