Peace psychologists emphasize the importance of recognizing both direct and structural bases of peace and conflict. In the peace psychological analysis of terrorism presented here, I attempt to further our understanding of the bases of terrorism in the context of how inequities in political, economic, and social structures may feed into or exacerbate terrorism. I analyze the effectiveness of responses to terrorism in terms of the tripartite peacekeeping, peacemaking, and peacebuilding model of nonviolent response to violence.Prior to the 9/11 attacks on the World Trade Center and the Pentagon, peace psychologists interested in international themes of peace, conflict, and violence focused primarily on conflicts outside the borders of the United States. The principal arenas that caught their attention were Palestine and Israel, Bosnia, Kosovo, and Serbia, Northern Ireland, Angola, South Africa, Rwanda, Sri Lanka, India, and Pakistan.The 9/11 attack, however, pushed international terrorism to the fore (Wagner, 2002). U.S. psychologists began to focus on the causes and effects of terrorism, from both practical and scholarly perspectives. Psychology's initial concern was, understandably, with treating the psychological aftermath of 9/11: the mental health of injured survivors, families of victims, people living close to the sites of the attacks, as well as the fire and police personnel and emergency relief workers who responded to the catastrophe. Reports indicate that in this realm, psychologists provided invaluable assistance to those affected by the attacks (see, for example, articles in the November 2001 issue of the American Psychological Association's Monitor on Psychology, which describe a range of psychologists' services).Some peace psychologists were among those who provided services to direct and indirect victims. Some others, however, have found themselves in a professional quandary, actively questioning how best to respond to terrorist attacks. Peace