This short introduction argues that the recent insistence of researchers on “new group selection”—i.e. on scenarios with groups making more individuals—may lead multilevel selection theory towards marginalization, if not even towards a new controversial or questionable status. This seems to indicate that a more sure-footed position for multilevel selection theory would be acquired if we were to show a renewed interest in “old group selection”, i.e. in scenarios in which the differential reproduction of the groups themselves affects the frequencies of either individual-level or group-level traits. The contributions to this volume are then briefly presented, with an emphasis on how, even though they may not openly endorse the above idea, they do seem to point in its direction.
KeywordsMultilevel selection Kin selection Contextual analysis Altruism
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