theories or using them to guide empirical research. Instead is a focus on what they call a simplistic hypothesis testing, which emphasizes discovering well-verified empirical regularities. They state that to be a mistake because insufficient attention to theory leads to misspecified empirical models or misleading measures of key concepts. They also point out that because of the poor quality data in international relations, it is less likely that the efforts will produce cumulative knowledge. It will lead to only a short-term gain and will make scholarship less useful to concerned citizens and policymakers. Theories give a scholar an overarching framework of the myriad realms of activity. Theories are like maps and aim to simplify a complex reality, but unlike maps, theories provide a causal story by saying that one or more factors can explain a particular phenomenon. Theories attempt to simplify assumptions about the most relevant factors in the aim to explain how the world works. Some grand theories like realism or liberalism claim to explain broad patterns of state behavior, and middle-range theories focus on more narrowly defined phenomena like coercion, deterrence, and economic sanctions. They list eight reasons why theories are important. The problems that arise from inadequate attention to theory is that it is impossible to construct good models or interpret statistical findings correctly. By privileging hypothesis testing, that is overlooked. It might make sense to pay more attention to hypothesis testing if it produced much useful knowledge about international relations, but Mearsheimer and Walt claim that this is not the case and that the simplistic hypothesis test is inherently flawed. Selection bias is also a problem that arise from inadequate attention to theory. To examine that more clearly, the authors point out James Fearson's critique of Paul Huth and Bruce Russett's analyses of extended deterrence. Mearsheimer and Walt also point out that contemporary international relations scholarship faces challenging measurement issues because of inadequate attention to theory and cause misleading measures. A few examples are given to support their claim, including Dan Reiter and Allan Stam's Democracies at War. Mearsheimer and Walt state that it is a sophisticated study but contains questionable measures of key concepts and that the measures to test their idea do not capture the theories' core concepts. Poor data, the absence of explanation, and the lack of cumulation are other problems, arising from inadequate attention to theory and focusing too much on simplistic