Causal Inquiry in International Relations (Oxford UP, 2024) by Adam R. C. Humphreys and Hidemi Suganami defends a new, philosophically informed account of the principles which must underpin any causal research in a discipline such as International Relations. Its central claim is that there is an underlying logic to all causal inquiry, at the core of which is the search for empirical evidence capable of ruling out competing accounts of how specific events were brought about. Although this crucial fact is obscured by the ‘culture of generalization’ which predominates in contemporary social science, all causal knowledge ultimately depends on the provision of empirical support for concrete claims about specific events, located in space and time. 

Causal Inquiry in International Relations not only explores existing philosophical debates around causation; it also provides a detailed study of some of the most fundamental methodological questions which arise in the course of causal inquiry. Using examples drawn from philosophy and from the study of international relations, it demonstrates what is problematic about established ways of thinking, brings new clarity to both philosophical and methodological questions, and seeks to enhance collective understanding of the contribution that causal inquiry can make to empirically rich and critically aware scholarship about world politics. It concludes by situating ‘causal inquiry’ in relation to other forms of inquiry employed in the study of world politics, emphasizing especially the often unnoticed dependence of causal inquiry on precisely the kind of knowledge of specific events which historians are well placed to provide.

Adam Humphreys is Associate Professor and Head of Department in the Department of Politics and International Relations, University of Reading. He joined the University of Reading in 2013, having previously been a British Academy Post-Doctoral Fellow at the University of Oxford (2007-10) and Fellow in Politics at Brasenose College, Oxford (2010-13). His principal research interests are in International Relations theory and meta-theory, especially causation and causal explanation, realism and neo-realism, the English School, and the relationship between theory and history. He also has research interests in British foreign and defence policy, strategy, and the ethics of war.
Hidemi Suganami studied International Relations at Tokyo, Aberystwyth, and London Universities. His first academic appointment was at Keele in 1975, where he later became Professor of the Philosophy of International Relations. In 2004, he moved to Aberystwyth, where currently he is Emeritus Professor of International Politics. His publications include: The Domestic Analogy and World Order Proposals (1989); On the Causes of War (1996); and, with Andrew Linklater, The English School of International Relations (2006). Over a number of years, he has been studying philosophical issues surrounding causation and explanation in International Relations.

Stephen Satkiewicz is an independent scholar with research areas spanning Civilizational Sciences, Social Complexity, Big History, Historical Sociology, Military History, War Studies, International Relations, Geopolitics, and Russian and East European history.

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