Charles Ragin is Chancellor’s Professor of Sociology at the University of California, Irvine. His main interests are methodology, political sociology, and comparative-historical research. His books include Redesigning Social Inquiry: Fuzzy Sets and Beyond (University of Chicago Press), Fuzzy-Set Social Science (University of Chicago Press), The Comparative Method: Moving Beyond Qualitative and Quantitative Strategies (University of California Press), and Constructing Social Research: the Unity and Diversity of Method (Pine Forge Press). He is the author of more than 150 articles in research journals and edited books, and he has developed software for set-theoretic analysis of social data, Fuzzy-Set/Qualitative Comparative Analysis (www.fsQCA.com). His awards include the Stein Rokkan Prize and the Donald Campbell Award for Methodological Innovation.