"Psychological concepts and processes in an interdisciplinary understanding of Genocide: origins, prevention and reconciliation." Ervin Staub, University of Massachusetts at Amherst In the general genocide literature, there is surprisingly little use of psychological concepts. A valid understanding of the roots and prevention of genocide and mass killing, and of reconciliation after genocide or mass killing between groups (which is essential when people continue to live together, as in Rwanda, to avoid new violence) requires an interdisciplinary approach. But the psychology of groups (and their individual members) is an important component of such understanding. A model will be presented to address these issues with psychological concepts and processes as significant components of them. Among the concepts and processes these will include, in the realm of understanding and prevention, the role of basic human needs, a history of devaluation and ways to humanize the "other," psychological wounds due to past victimization and the healing of wounds, combined with more structural elements such as unjust versus just social arrangements and the absence of pluralism versus broad societal participation in the public domain. In the realm of reconciliation, these concepts and processes will include truth, justice and a shared (in place of conflicting) history.