The promise of peace, the problem of war. The meanings of peace. Peace movements. The meanings of wars. The special significance of nuclear weapons -- The reasons for wars. The individual level. The group level. The state level. The decision-making level. The ideological, social, and economic levels -- Building negative peace. Diplomacy, negotiations, and conflict resolution. Peace through strength? Disarmament and arms control. International organizations. International law. World government. Ethical and religious perspectives -- Building Positive Peace. Human rights. Ecological well-being. Nonviolence. Personal transformation and the future