Book excerpt: Utilizing data from a survey of attitudes and behavior of more than 2,500 residents of selected rural, urban, and university communities in the Federal Republic of Germany, Edward Muller attempts to formulate and to test a general multivariate theory about what motivates individuals to participate in aggressive political action. Since this kind of political behavior is infrequent in addition to being difficult to measure, it rarely has been subjected to rigorous scientific investigation at the micro-level. Professor Muller's study is an attempt to understand the causes of aggressive political participation using quantitative techniques. Originally published in 1979. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.