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What Do We Know About Civil War Duration? A Bargaining Perspective  

David E. Cunningham

Civil wars vary greatly in duration—some end within months; others last for decades. What explains this variation? Civil wars drag on when no combatant can win a military victory and the various actors involved are unable, or unwilling, to reach a compromise agreement that resolves the war. Military victory does happen in civil war, but it is rare, so understanding why civil wars last as long as they do requires examining the barriers to negotiated settlement. Wars last longer when the parties involved perceive the war as less costly relative to peace and when the combatants are overly optimistic about how they will do in the war. Even when key decision-makers see the war as costly and are realistic about their chances of prevailing, negotiated settlements prove elusive if the parties cannot accept a division of the issues at stake or if the government or rebels are unable to trust the commitments the other side makes in a negotiation. Additionally, bargaining is more complicated when there are more combatants that must accept the terms of any agreement, and conflicts with more combatants last much longer than those with fewer. Many factors affect the bargaining environment, and these barriers to bargaining can explain why civil wars are on average quite long. International actions can alleviate some of the barriers and help combatants reach comprehensive settlements, as happened in the conflicts in Mozambique, El Salvador, Guatemala. In particular, peacekeeping and mediation strategies are effective at resolving wars sooner. International action in general is more effective, however, when the parties involved are interested in peace but need some help overcoming commitment or informational problems. These actions are much less successful when that interest is lacking. The current civil war in Syria has many of the factors identified as prolonging wars. It is an extremely fractionalized conflict, and many external actors are involved. Syria has a large majority population that has been historically excluded from political power and economically marginalized, and a minority government that has been dominant. These factors make reaching a comprehensive settlement very challenging and mean the war is likely to be very long-lasting.


Long Cycle and World-Systems Theoretical Research Programs  

Christopher Chase-Dunn and Hiroko Inoue

Substantial overlaps are found between world-systems and long-cycle theoretical research programs in this study of the emergence and growth of sociocultural complexity and hierarchy. Although these two approaches have different theoretical ancestors and significantly different conceptual vocabularies, they mainly converge with regard to crucial elements such as units of analysis and changes in the distribution of power.


Immigration and International Political Economy  

Margaret E. Peters

Immigration has largely been neglected as part of the study of International Political Economy (IPE) until recently. Currently, IPE scholars have focused on two questions regarding immigration: what explains variation in public opinion on immigration and what explains variation in immigration policy. The scholarship on public opinion on immigration has largely been divided into two camps, those who argue that economic factors drive opinion and those who argue that cultural factors are the driver. Those who study the role economic factors have played in shaping opinion on immigration often start with the Stolper-Samuelson theorem. The Stolper-Samuelson theorem shows that while immigration increases the overall size of the economy, it has different distributional effects. Immigration increases the size of the labor pool and, thus, should increase the returns to capital while decreasing wages. As such, those who derive most of their income from capital should favor immigration while those who derive most of their income from wages should oppose immigration. Additionally, the Stolper-Samuelson model shows that openness to trade should have the same effects as open immigration; thus, people should oppose or favor both trade and immigration. Early scholarship examined these predictions and found that opposition to immigration was much higher than opposition to trade and that those who derive much of their income from capital also oppose immigration at high rates. In response, one set of scholars focused on the additional costs that immigration, but not trade, brings. Immigrants, unlike goods, may place a burden on the social welfare system and thus, opposition to immigration especially by the wealthy may be driven by these costs. Other scholars noted that immigrants work in many industries that are unaffected by trade—most notably the service sector—and this may explain opposition to immigration. Finally, a third group has argued that opposition to immigration is largely driven by cultural concerns and xenophobia. Currently, this debate continues with both sides examining more nuanced survey data. Scholarship on immigration policy has similar divides. Immigration policy has become more restrictive since the late 19th and early 20th centuries, when most countries had very few restrictions on immigration. To explain these restrictions, one school of scholars has argued that labor unions oppose immigration, as it hurts the wages of their members. As unions gain strength, immigration should become more restricted. Others focus on the rise of the welfare state, arguing that immigration has been restricted to keep costs low. A third group has argued that greater political rights in the early and mid-20th century for the generally xenophobic working class has led to the restrictions. Finally, new scholarship argues that increased globalization—in the form of increased trade and increased foreign direct investment—has sapped business support for immigration, which has allowed anti-immigrant groups to have more say. Using a wealth of newly collected data, scholars are testing these different theories.


The Steps to War: Theory and Evidence  

Andrew P. Owsiak

The steps-to-war theory maintains that war results from the issues under dispute and how states handle these issues. Its foundation rests on the territorial explanation of war, which argues that territorial issues are more conflict-prone than non-territorial ones because these issues constitute a salient security threat that realism recommends be addressed via power politics (i.e., the use of force, including alliance- and armament-building). When states employ power politics, however, the dispute festers, thereby causing recurring militarized conflict; creating feelings of threat, enmity, and competition (i.e., rivalry); producing counter-alliances and arms races; and generally building the more hostile, war-prone world that states originally sought to avoid. Each step taken—from a territorial dispute to rivalry (i.e., recurring militarized disputes) to alliance-building to armament building—therefore increases the probability that war will occur. Existing empirical evidence supports the steps-to-war theory’s predictions in numerous ways. Tests of the entire theory, for example, demonstrate the dangerousness of territorial disputes, the tendency to manage territorial disputes via power politics, and that individual steps reinforce one another. Other bodies of research connect the individual steps directly to the likelihood that war will occur or highlight the connections between these individual steps—much as the theory predicts. Despite strong empirical support, however, much work remains to be done. Future research should consider the sequencing of the steps to war, investigate why the effects of certain steps vary across different epochs (e.g., alliances differ in their effects on war during the 18th and 19th centuries), identify the alternative paths to war, and study the paths to peace more explicitly—as obtaining peace may not be as simple as removing the known causes of war.


Rediscovering Reputation Through Theory and Evidence  

Mark J. C. Crescenzi and Bailee Donahue

Reputation as it applies to the arena of international relations is information adhering to a state or its leaders about behavioral or intentional characteristics relating to cooperation or conflict. The study of reputation in world politics has waxed and waned in recent decades, but is enjoying a renaissance both in terms of theoretical and empirical analysis. We review the origins of the study of reputation in world politics, as well as the post-Cold War context that contributed to reputation’s apparent demise. We then focus on the recent rediscovery of reputation through the development of new theoretical and empirical analyses. These works have overcome earlier challenges to the conceptualization and measurement of reputation to improve our understanding of how this phenomenon affects coordination, cooperation, and conflict among and between states in the international arena.


Systemic Leadership, Energy Considerations, and the Leadership Long-Cycle Perspective  

William R. Thompson and Leila Zakhirova

System leaders, sometimes referred to as hegemons or world powers, emerge based on a foundation of technological innovation and global military reach. To this foundation energy is now added as a third leg of the power stool. It is not a coincidence that observers posit 17th-century Netherlands, 19th-century Britain, and 20th-century United States as the leading states in political-economy terms of their respective eras. The Dutch used peat and windmills, the British married coal to the steam engine, and the United States added petroleum and electricity to coal to fuel a host of new machines. The greater a country’s lead in technology and energy, the more impactful its tenure as the world economy’s lead economy. These leads, nonetheless, do not make their principal beneficiaries into dominant dictators of world politics. Instead, they focus on policing long-distance commercial routes and the global commons, as well as organizing coalitions to suppress perceived threats to the continued functioning of the world economy. Whether this process, which emerged slowly only in the second millennium ce, will continue into the future remains to be seen. It hinges on the prospects for abandoning carbon-based fuels, adapting renewable energy sources, and retaining the ability of one state to maintain a political-economic lead over its rivals for decades as in the past.


Intrastate Conflict and Civilian Victimization  

Reed M. Wood

Contemporary civil conflicts frequently impose disproportionate costs of civilian populations. By some estimates, roughly 90% of conflict causalities were combatants in the wars of the early 20th century, but by the end of the century nearly 90% of causalities were civilians. While scholars have spent decades examining phenomena such as genocide and terrorism, they have only recently begun to systematically examine the causes, consequences, and potential solutions to the more general occurrence of civilian victimization during intra-state armed conflict. What is civilian victimization, and how does it differ from other forms of political violence? Is it possible to differentiate between “collateral damage” and intentional civilian targeting during civil conflicts? While virtually all conflicts impose significant costs on civilians, those costs vary tremendously across armed conflicts. Moreover, while collateral damage is an unfortunately common feature of warfare, violence perpetrated against civilians often includes massacres, bombings of civilian targets with negligible military value, summary executions, ethnic cleansing, and other forms of intentional attacks on noncombatants. Yet, these practices are comparatively more common during some wars, in some areas, or by some groups. This variation suggests that while all internal conflicts are violent, certain characteristics of actors, the conflict spaces, and/or the patterns of interactions between rebels, the government they challenge, and civilians within the conflict zone explain why some conflicts produce greater levels of abuse against civilians than do others. Do similar factors explain both government-sponsored civilian victimization and violence committed by non-state actors during civil conflict? A cursory review of available data clearly demonstrates that both state and non-state forces often engage in high levels of civilian victimization. In general, the existing evidences suggest that the motives for state and non-state actor violence are similar. However, key differences in the nature of institutional and organizational arrangements suggest that rebels and governments experience different types of constraints on their ability to act on their motives. How can the international community effectively respond in order to reduce the severity of civilian victimization in ongoing conflicts? This important policy question has produced a range of conflicting answers; however, the most recent scholarship on the topic suggests that both United Nations peacekeeping operations—particularly when they include a strong mandate for civilian protection and a robust military force—and international condemnation (“naming and shaming”) can effectively reduce the magnitude of intentional violence against civilians.


Social Identity Theory: Status and Identity in International Relations  

Deborah Welch Larson

Social identity theory (SIT) from social psychology provides a means to explore the influence of identity and status concerns on foreign policy. The theory argues that groups are motivated to achieve a positively distinctive identity. Groups compare themselves to a similar but slightly higher reference group. Inferiority on important dimensions may lead to the adoption of an identity management strategy: social mobility (emulating the higher-status group to gain admission), social competition (striving to equal or surpass the dominant group), or social creativity (revaluing an ostensibly negative characteristic as positive or identifying an alternative dimension on which the group is superior). Applied to international relations, states may pursue social mobility by emulating the values and practices of higher-status states in order to be admitted to a higher standing, much as Eastern Europe did in seeking admission into the European Union after the end of the Cold War. If elite groups are impermeable to new members, and the status hierarchy is perceived to be unstable or illegitimate, aspiring powers may engage in social competition, which usually entails territorial conquest and military displays. During the Cold War, the Soviet Union sought to catch up with and surpass the capitalist states. If elite clubs are not permeable, but the status hierarchy is stable, states may seek status through social creativity—either reframing a negative trait as positive or seeking preeminence in a domain apart from geopolitical competition. Social creativity may entail creating new international institutions, promoting new norms, or engaging in major diplomatic initiatives in order to increase the state’s prestige. Research applying SIT to international relations has addressed the question of whether anarchy necessarily leads to conflict between states, the diffusion of values, the selection of an identity discourse on the domestic level, and state efforts at moral leadership. Critics have charged that SIT does not clearly predict which identity management strategy will be chosen in a given situation. From a realist perspective, the selection of a strategy for enhancing a state’s status is constrained by geographic position, size, and natural endowments. But this argument does not consider the availability of social mobility and social creativity as ways to achieve status that do not depend on relative military power.


Clarifying Causal Mechanisms in International Relations  

Patrick James

Theory and evidence about causal mechanisms, at some point (probably) long ago, reached the carrying capacity for integration into knowledge through expression in words alone. Causal mechanisms, through the implementation of systemism in the discipline of international relations, need clarifying. Systemism is used to convey and analyze the contents of a primary source, Causes of War, by Jack Levy and William Thompson. Explaining war is the most long-standing empirical problem, in the sense of Laudan, in the field of international relations. (Laudan suggested, quite helpfully, a shift from empirical content to problem-solving ability for assessing theories with regard to scientific progress.) The diagrammatic approach from systemism is used to translate a narrative from Levy and Thompson into a series of figures that include causal mechanisms from respective areas of theorizing about the causes of war. The overall purpose of this exercise is to show how the approach from systemism possesses the potential to convey causal mechanisms in a way that facilitates scientific progress. All of this augurs well for a visual turn—toward approaches, such as systemism, that can help to more effectively assemble the massive amount of information now available into knowledge about international relations. Systemism’s essence has been conveyed by its most long-standing exponent, Bunge: a commitment to building comprehensive theories. Systemism transcends reductionism and holism as the other available “coherent views” with respect to operation of a social system. Instead of theorizing at the level of the system (holism) or its components (reductionism), systemism allows for linkages operating at macro- and microlevels, along with back and forth between them. Systemism also includes inputs from, and outputs to, the environment. This comprehensive procedure facilitates the comparison of alternative visions regarding cause and effect. Thus systemism is an approach rather than a substantive theory. One of its distinguishing merits is a capacity to facilitate criticism and comparison of theories through their representation in diagrams that are constructed under a set of rules to convey causal mechanisms.


Democratization and Conflict  

Ömer Faruk Örsün, Reşat Bayer, and Michael Bernhard

Is democratization good for peace? The question of whether democratization results in violence has led to a spirited and productive debate in empirical conflict studies over the past two decades. The debate, sparked by Mansfield and Snyder’s foundational work, raised a challenge to the notion of a universal democratic peace and elicited numerous critical responses within the literature. One set of such responses has emphasized issues of replicability, mismatches between the research design and directionality of the proposed causal mechanism, the role of outliers, and model specification. In addition, two issues have not been discussed sufficiently in the existing literature. First, conceptually, is the issue of concept stretching, specifically the form Sartori labeled the “cat-dog” problem. While past criticisms were mainly about model specification, we debate whether Mansfield and Snyder’s findings can be seen as a product of concept misformation. Second, quantitatively, are conceptual and empirical issues that Mansfield and Snyder use to capture state strength in their most recent attempts to provide ongoing evidence for their theory. The most optimistic estimates show that even when democratization has a statistically significant association with war onset at lower levels of institutional strength, the effect is substantively insignificant.


Empirics of Stable Peace  

Reşat Bayer

Much of the empirical international relations research implicitly equates peace with the absence of war. Moreover, causes of war are seen as sufficient for understanding peace. Such an approach turns peace into a nonevent. The stable peace literature has challenged this perspective in several ways. Firstly, peace is multilayered and additional dimensions are considered beyond violence. Secondly, it attempts to explain movements among different levels (or qualities) of peace. This study reviews the stable peace literature. It also considers alternate conceptualizations of peace. Findings from comparative case studies are considered next to those from the emerging quantitative literature that explicitly focuses on peace. Attention to internal peace and links between micro and macro levels of analysis are some of the areas highlighted as needing greater attention.


Domestic Coalitions: International Sources and Effects  

Etel Solingen and Peter Gourevitch

The centrality of domestic coalitions serves as transmission belts between the domestic and international realms. Despite its long lineage in international and comparative political economy and its relevance to the understanding of contemporary responses to globalization, coalitional analysis has been typically neglected when explaining outcomes in international relations. The analytical framework adopted here builds on two “ideal-typical” coalitions—an “inward-nationalist” and an “outward-internationalist” model—each advancing competing models across industrialized and industrializing contexts alike. Several applications illustrate the breadth and scope of this framework, spacious enough to explain economic responses in Europe from the repeal of the Corn Laws to the 20th century; the security implications of economic responses leading to World War I; the impact of internationalization on regional orders in the industrializing world since 1945; the relationship between coalitional approaches to the global economy and nuclear weapons proliferation since 1970; and the relevance of coalitional divides to outcomes regarding Brexit, Donald Trump’s election, and beyond. Coalitional analysis thus (a) offers important insights on wide-ranging empirical phenomena in comparative and international politics that institutional approaches alone fail to explain; (b) provides a unifying framework addressing trans-historical responses to globalization, nationalism, ethno-confessionalism, and their effects on interstate relations; (c) attends to political cleavages in political economy that intersect with security; (d) transcends dated level-of-analysis categories by linking subnational and global processes; (e) is flexible enough to accommodate wide variation in state–society relations and political institutionalization; (f) grounds politics in a dynamic framework able to explain both continuity and change; and (g) clarifies contradictory findings regarding interdependence and war by providing a mechanism explaining why, when, and how economic exchange with the world may or may not inhibit war.


Bargaining Theory, Civil War Outcomes, and War Recurrence: Assessing the Results of Empirical Tests of the Theory  

Caroline A. Hartzell

Once ended, a significant number of civil wars recur. One influential empirical international relations theory on which scholars have drawn in an effort to provide an explanation for this phenomenon is the bargaining model of war. Devised initially for the study of interstate war, the theory posits that bargaining problems may prevent belligerents from reaching a deal that enables them to avoid a costly war. Bargaining problems also have been identified as contributing to the recurrence of armed intrastate conflict. Working within the framework of bargaining theory, a number of scholars have claimed that the most effective way to inhibit a return to civil war is to end the conflict via military victory as such an outcome is thought to help solve key bargaining problems. However, a growing number of empirical tests cast doubt on this proposition. An analysis of the results of these tests as well as new scholarship on civil war termination highlight some of the limitations inherent in employing a theory devised for the study of interstate war to analyze questions related to civil wars.


Population Aging and International Conflict  

Mark L. Haas

Most of the world has experienced a revolutionary and unprecedented development over the course of the last century and especially since the end of the Second World War: significant population aging. By any standard measure—median age, the number of 60- or 65-year-olds and over as a percentage of a population, or old-age dependency ratios (the ratio of seniors to working-age adults), most of the world is significantly older today than in the middle of the 20th century, and the trend is accelerating. The world’s great powers have not been immune to this trend. To the contrary, many of these countries have been leading the way, aging faster and to a greater extent than most other countries. By 2050, the median age of China, France, Germany, Japan, Russia, the United Kingdom, and the United States will be at least 40. Germany and Japan are currently two of the oldest countries in the world, and China is likely aging faster than any other country in history. How is the near worldwide phenomenon of population aging likely to affect international relations (IR)? Most scholars who have examined this issue have linked the potential effects created by aging to established IR theories. Most analyses that have developed around the issue of aging, in other words, have not created new theoretical approaches to the study of international politics. They have instead argued that aging is likely to affect key variables associated with existing IR theories, which will then tend to generate particular outcomes based on these theories’ predictions. The IR theories that studies of populating aging have most frequently tied into include ones from realist, diversionary war, and constructivist research programs. Many of the arguments that link the effects of aging to these theories reach opposite conclusions, with some predicting a much higher probability of international conflict due to aging, others the reverse. There are, however, very few empirical analyses that test these competing hypotheses, largely because aging is such a new phenomenon.


Network Science and International Relations  

Zeev Maoz

Network analysis has been one of the fastest-growing approaches to the study of politics in general and the study of international politics in particular. Network analysis relies on several key assumptions: (a) relations are interdependent, (b) complex relations give rise to emergent and unintended structures, (c) agents’ choices affect structure and structure affects agents’ choices, and (d) once we understand the emergent properties of a system and the interrelations between agents and structure, we can generalize across levels of analysis. These assumptions parallel many of the key features of international relations. Key contributions of network analysis helps shed light on important puzzles in the study and research of international relations. Specifically, (a) network analytic studies helped refine many key concepts and measures of various aspects of international politics; (b) network analysis helped unpack structures of interdependence, uncovering endogenous network effects that have caused biased inferences of dyadic behavior; (c) network analytic studies have shed light on important aspects of emergent structures and previously unrealized units of analysis (e.g., endogenous groups); and (d) network analytic studies helped resolve multiple puzzles, wherein results found at one level of analysis contradicted those found at other levels of analysis.


Agent-Based Computational Modeling and International Relations Theory: Quo Vadis?  

Claudio Cioffi-Revilla

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.


The International Determinants of Military Coup Behavior  

Ekim Arbatli and Cemal Eren Arbatli

Why do coups d’état happen? Although many studies have investigated this question, they pay relatively little attention to the international causes and ramifications of coups. Especially, empirical studies on the external determinants of coup risk and outcomes still remain limited. There are two current lines of research in this direction. The first line studies international linkages and coup risk, looking at the external determinants of coups: regional spillover effects, foreign linkage, and foreign leverage. A promising angle on this front is focusing on the role of post-coup reactions from international actors to illuminate how coup plotters shape their incentives under outside pressure. The second line of research investigates interstate conflict and coup risk, considering diversionary behavior and external threats as potential coup-proofing strategies. In this effort, studying the relationship between external threat environment and coup risk can be fruitful, whereas empirical tests of the classical diversionary war theory will yield relatively marginal contributions. Currently, three issues stand out in the empirical coup literature that should be further addressed by scholars. First is the need for more extensive and systematic data collection efforts to obtain detailed information about the identities, targets, and motives of coup perpetrators. Second, the external sources of leader insecurity beyond interstate conflicts remain an underexplored area. Third, although many studies have tried to determine when coup attempts happen, scholarly knowledge of when and how they succeed remains very limited. More work is needed to uncover the determinants of coup success across different regimes and leader survival scenarios.


What Helps Protect Human Rights: Human Rights Theory and Evidence  

Jessica Anderson and Amanda Murdie

Empirical international relations (IR) theory developed three generalized statements regarding why human rights abuses occur. First, human rights abuses are a way for an unrestrained state, especially the executive branch and its agents, to try to control individuals and hold on to power. Second, respect for human rights is an international norm, and international socialization and pressure about this norm can, in certain situations, affect behavior. Third, the codification of human rights norms into international treaties may influence behavior but, similar to our understanding of the effect of other treaties on state behavior, states only bind themselves weakly, and certain conditions are necessary for treaties to affect human rights.


What Do We Know About Global Financial Crises? Putting IPE and Economics in Conversation  

Michael J. Lee

Since the 1970s, financial crises have been a consistent feature of the international economy, warranting study by economists and political scientists alike. Economists have made great strides in their understanding of the dynamics of crises, with two potentially overlapping stories rising to the fore. Global crises appear to occur highly amid global imbalances—when some countries run large current account deficits and others, large surpluses. A second story emphasizes credit booms—financial institutions greatly extend access to credit, potentially leading to bubbles and subsequent crashes. Global imbalances are, in part, the product of politically contested processes. Imbalances would be impossible if states did not choose to liberalize (or not to liberalize) their capital accounts. Global political structures—whether international institutions seeking to govern financial flows, or hierarchies reflecting an economic power structure among states—also influence the ability of the global system to resolve global imbalances. Indeed, economists themselves are increasingly finding evidence that the international economy is not a flat system, but a network where some states play larger roles than others. Credit booms, too, and the regulatory structures that produce them, result from active choices by states. The expansion of the financial sector since the 1970s, however, took place amid a crucible of fire. Financial deregulation was the product of interest group knife-fights, states’ vying for position or adapting to technological change, and policy entrepreneurs’ seeking to enact their ideas. The IPE (international political economy) literature, too, must pay attention to post-2008 developments in economic thought. As financial integration pushes countries to adopt the monetary policies of the money center, the much-discussed monetary trilemma increasingly resembles a dilemma. Whereas economists once thought of expanded access to credit as “financial development,” they increasingly lament the preponderance of “financialized” economies. While the experimentalist turn in political science heralded a great search for cute natural experiments, economists are increasingly turning to the distant past to understand phenomena that have not been seen for some time. Political scientists might benefit from returning to the same grand theory questions, this time armed with more rigorous empirical techniques, and extensive data collected by economic historians.


Multilevel Governance as a Global Governance Challenge: Assumptions, Methods, Shortcomings, and Future Directions  

Joachim K. Rennstich

Multilevel governance (MLG) as a research approach has mostly been applied to explain governance issues surrounding the European Union or international organizations. As a general research framework in the area of international relations (IR) theory, however, MLG has widely been underutilized, despite the many advantages that the approach offers in the empirical investigation of an increasingly complex international or global system. There are key concepts, assumptions, and definitions of MLG that focus separately on levels and governance as key elements of the approach and its interdisciplinary lineage. Some contested IR concepts include sovereignty, the nation-state, the international system, anarchy, agency, and levels of analysis. These IR concepts benefit from the application of an MLG framework by enabling the use of an interdisciplinary and multimethodological, yet systematically comprehensive, approach—which allows for nuanced use of these concepts. Other areas that benefit from IR methodologies applied in MLG research are methodological toolkits with a special focus on the areas of global governance, security studies, and international political economy.