The concept of informed consent derives moral force as a mark of respect for persons. The request for informed consent envisions each human being as autonomous and capable of making informed judgments about personal activities.
Many traditional societies rely on an elder or a group of leaders to express decisions with respect to the group. An individual community member who acts independently, without the knowledge and consent of the group, might be seen as suspicious, perhaps acting counter to the best interests of the group. The appropriate way for a foreigner to get permission to do research in a setting like this would be to present the project in an open meeting, allowing questions to be raised and answered publicly. After formal group approval, any individual member of society would be free to cooperate or not with the research project.
In all societies, when research is planned in sharply defined communities, consultation with community representatives may be necessary in order to avoid negative gossip and refusals to participate. Such community consultation and public relations is part of a good research design and not a substitute for individual informed consent.