This article introduces political scientists to scenarios-future counterfactuals-and demonstrates their value in tandem with other methodologies and across a wide range of research questions. The authors describe best practices regarding the scenario method and argue that scenarios contribute to theory building and development, identifying new hypotheses, analyzing data-poor research topics, articulating "world views," setting new research agendas, avoiding cognitive biases, and teaching. The article also establishes the low rate at which scenarios are used in the international relations subfield and situates scenarios in the broader context of political science methods. The conclusion offers two detailed examples of the effective use of scenarios.In his classic work on scenario analysis, The Art of the Long View, Peter Schwartz commented that "social scientists often have a hard time [building scenarios]; they have been trained to stay away from 'what if?' questions and concentrate on 'what was?'" (Schwartz 1996:31). While Schwartz's comments were impressionistic based on his years of conducting and teaching scenario analysis, his claim withstands empirical scrutiny. Scenarios-counterfactual narratives about the future -are woefully underutilized among political scientists. The method is almost never taught on graduate student syllabi, and a survey of leading international relations (IR) journals indicates that scenarios were used in only 302 of 18,764 sampled articles. The low rate at which political scientists use scenarios-less than 2% of the time-is surprising; the method is popular in fields as disparate as business, demographics, ecology, pharmacology, public health, economics, and epidemiology (Venable, Li, Ginter, and Duncan 1993;Leufkens, Haaijer-Ruskamp, Bakker, and Dukes 1994;Baker, Hulse, Gregory, White, Van Sickle, Berger, Dole, and Schumaker 2004;Sanderson, Scherbov, O'Neill, and Lutz 2004). Scenarios also are a common tool employed by the policymakers whom political scientists study.This article seeks to elevate the status of scenarios in political science by demonstrating their usefulness for theory building and pedagogy. Rather than constitute mere speculation regarding an unpredictable future, as critics might suggest, scenarios assist scholars with developing testable hypotheses, gathering 1 We thank the reviewers of International Studies Review and participants of the 2010 Midwest Political Science Association Conference for their thoughtful feedback on earlier drafts.