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Agent-based computational modeling (ABM, for short) is a formal and supplementary methodological approach used in international relations (IR) theory and research, based on the general ABM paradigm and computational methodology as applied to IR phenomena. ABM of such phenomena varies according to three fundamental dimensions: scale of organization—spanning foreign policy, international relations, regional systems, and global politics—as well as by geospatial and temporal scales. ABM is part of the broader complexity science paradigm, although ABMs can also be applied without complexity concepts. There have been scores of peer-reviewed publications using ABM to develop IR theory in recent years, based on earlier pioneering work in computational IR that originated in the 1960s that was pre-agent based. Main areas of theory and research using ABM in IR theory include dynamics of polity formation (politogenesis), foreign policy decision making, conflict dynamics, transnational terrorism, and environment impacts such as climate change. Enduring challenges for ABM in IR theory include learning the applicable ABM methodology itself, publishing sufficiently complete models, accumulation of knowledge, evolving new standards and methodology, and the special demands of interdisciplinary research, among others. Besides further development of main themes identified thus far, future research directions include ABM applied to IR in political interaction domains of space and cyber; new integrated models of IR dynamics across domains of land, sea, air, space, and cyber; and world order and long-range models.

This article examines scholarship in the field of foreign policy analysis inspired by the philosophy and social theory of American Pragmatism. Pragmatism is reconstructed as a unified theory of human thought and action emphasizing the primacy of practice and situated creativity. It has been largely ignored in International Relations (IR), in general, and foreign policy analysis (FPA), in particular, during the 20th century. Given the fact that pragmatism is widely taken to be one of the few genuinely “American” social theories, its marginal role in IR scholarship is astounding since the discipline has rightly been characterized as an “American social science” (S. Hoffmann). Against this background the article highlights one of the prominent disciplinary dualisms, the distinction between “systemic” theories of international politics/relations on the one hand and “sub-systemic” foreign policy analyses on the other. It does so, however, as an entry point for a different perspective. Pragmatist thought entered the field in the mid-1990s at a moment when increasing numbers of scholars felt uneasy about this dualism because it severed human agency from internally connected transformations at the global level of political interaction. The proliferation of paradigmatist scholarship about German foreign policy after the country’s unification in 1990 illustrates both how established “paradigms” grappled with “change” and “continuity” in German foreign policy and how pragmatism was mobilized as a theoretical resource in order to respond to this challenge. Pragmatism is a distinctive social theory that starts with what people do (primacy of practice) and that conceives of theories as tools for coping. Rather than distinguishing between thought (or theory) on the one hand and action (or practice) on the other as separate activities, pragmatism emphasizes the unity of all problem-solving forms of “inquiry” (J. Dewey). Inquiry removes doubt and enables us to form beliefs (as “rules for action”). Methodologically this understanding translates into a rejection of the separation of “theory” and “subject matter” in favor of empirically grounded reconstructive approaches. In addition to pragmatist perspectives on epistemology and methodology, the article highlights different ways of substantive theorizing in IR/FPA such as habits, practices, and loyalties but also normative accounts.

The rise of non-state (international, private, and transnational) actors in global politics has far-reaching consequences for foreign policy theory and practice. In order to be able to explain foreign policy in the 21st century, foreign policy research needs to take into account the growing importance of nonstate actorss. A good way to do this would be to engage the literature on globalization and global governance. Both fields would benefit from such an exchange of ideas because their respective strengths could cancel out each other’s weaknesses. Foreign policy research, on the one hand, has a strong track record explaining foreign policy outcomes, using a broad range of theoretical concepts, but almost completely ignores non-state actors. This is highly problematic for at least two reasons: first, foreign policy is increasingly made in international organizations and intergovernmental and transnational governance networks instead of national institutions like foreign ministries. Second, the latter increasingly open up to, and involve, non-state actors in their policymaking procedures. Thus, if foreign policy research wants to avoid becoming marginalized in the future, it needs to take into account this change. However, systemic approaches like neorealism or constructivism have difficulties adapting to the new reality of foreign policy. They stress the importance of states at the expense of non-state actors, which are only of marginal interest to them, as is global governance. Moreover, they also conceptualize states as unitary actors, which forecloses the possibility of examining the involvement of non-state actors in states’ decision-making processes. Agency-based approaches such as foreign policy analysis (FPA) fare much better, at least in principle. FPA scholars stress the importance of disaggregating the state and looking at the individuals and group dynamics that influence their decision-making. However, while this commitment to opening up the state allows for a great deal more flexibility vis-à-vis different types of actors, FPA research has so far remained state-centric and only very recently turned to non-state actors. On the other hand, non-state actors’ involvement in policymaking is the strong suit of the literature on globalization and global governance, which has spent a lot of time and effort analyzing various forms of “hybrid” governance. At the same time, however, this literature has been rather descriptive, so far mainly systematizing different governance arrangements and the conditions under which non-state actors are included in governance arrangements. This literature could profit from foreign policy research’s rich theoretical knowledge in explaining policy outcomes in hybrid governance networks and international organizations (IOs). Foreign policy researchers should take non-state actors seriously. In this regard, three avenues in particular are relevant for future research: (1) comparative empirical research to establish the extent of non-state actors’ participation in foreign policymaking across different countries and governance arrangements; (2) explanatory studies that analyze the conditions under which non-state actors are involved in states’ foreign policymaking processes; and (3) the normative implications of increased hybrid foreign policymaking for democratic legitimacy.