Book excerpt: This book seeks to identify the motivations of individual perpetrators of ethnic violence. The work develops four models, labeled Fear, Hatred, Resentm ent, and Rage, gleaned from existing social science literatures. The empirical chapters apply these four models to important events of ethnic conflict in Eastern Europe, from the 1905 Russian Revolution to the collapse of Yugoslavia in the 1990's. Each historical chapter generates questions about the timing and target of ethnic violence. The four models are then applied to the case, to learn which does the best job in explaining the observed patterns of ethnic conflict.