Standing on the methodological frontier of field experimentation, researchers studying politics face a unique set of challenges. How do field researchers interact with policymakers, public officials, and funding agencies? How do they ensure high standards in the generation and reporting of empirical results? How can they redefine the role that experimental methodology plays in the study of politics today? This volume of The ANNALS addresses these questions, examining the use and application of the field experiment method in political science and presenting the state of the art in this important field.This important volume of The ANNALS features provocative and insightful contributions that reflect the ways that field researchers, in an international context, use the method in novel ways and tackle more subtle challenges of design and analysis. This volume is a must-read for researchers of politics and policy – especially those ready to expand the substantive and methodological frontiers of field experimentation. It is also a valuable resource for political scholars and policymakers.