Fred Greenstein, an acknowledged authority in this field, lays out conceptual and methodological standards for carrying out personality-and politics inquiries, ranging from psychological case studies of single actors, through multi-case analyses of types of political actors, to aggregative analyses of the impact of individuals and types of individuals on political systems and processes. Originally published in 1987. 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.