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As per my shallow research, IR literature and online content intermix Scientific and Behavioral Approach to International Relations. What exactly is the difference between the Scientific and Behavioral approach to International Relations? Elaboration will be highly appreciated.

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The Behavioral Revolution and International Relations provides a broad overview of both rational and behavioural approaches to international relations, beginning with the recent conflict between the U.S. and Iraq as the preface by which different approaches to international relations analyze the strategies involved on either side at different points in time

What explains the strategically costly and ill-planned American invasion and occupation of Iraq? What accounts for Saddam Hussein's failure to take actions that might have deflected it? These decisions can be explored with rationalist tools, including the existence of credible commitment problems and asymmetries in information. 1 But explanations of this sort beg a number of important questions. The Clinton and Bush administrations did not differ substantially in their information about Iraq. But Bush administration officials—and the president himself—did hold beliefs that differed substantially from those of their predecessors, and those beliefs had profound effects.

Decision making by both Iraqi and US leaders displayed strong biases. Saddam Hussein failed to recognize that the United States was committed to war unless he was willing to reveal credibly that he had, in fact, dismantled his weapons of mass destruction. The United States signaled its intentions repeatedly, but the Iraqi leader remained impervious to new information. Bush administration officials believed that the Americans would be greeted as liberators and democracy would flourish of its own accord. Such motivated reasoning both precipitated war and contributed to the failure to plan adequately for rebuilding the Iraqi state in war's wake. The causes of the Iraq War and the disastrous consequences of its aftermath appear to lie as much in the realm of beliefs and decision making as in standard theories of bargaining.

Rational approach

From an analytical perspective, the rational model assesses practical realities and from the expected outcomes of various potential decisions, selects the prospective decision that the primary actors will make. For example, if the geography of a region is rich in mineral or metal resources, it is rational to anticipate mining to occur. The resources are there, actors will attempt to control those resources and make the most possible profit from the enterprise. War could ensue over various entities vying for dominance of the geographic region which contains natural resource deposits.

Behavioural approach

The behavioural approach would tend to not simply base the assessment on the rational and practical tendency to extract minerals and metals from the geography; instead, experimental models using humans as actors would simulate what decisions the actors might make regarding the natural resource deposits. That is, if the geography is historically significant to the populace, intensified mining could be halted or reduced by the primary actors to preserve the cultural significance of the region, instead of employing the rational choice of extracting as much resources as possible from the geography, irrespective of behavioural implications, those behavioural nuances could be primary factors in assessing long-term policy decisions that might appear to be contrary to the scientific approach of harvesting as much resources and acquiring as much political power as is possible in the least amount of time.

Assessment

There is no bright line for the strategist mandating that they adhere to one of the particular models, or either of them; or not both simultaneously. The requirement is to achieve strategic advantage for the principal; irrespective of the academic labels applied to the means employed to do so.

  • A contemporary example of rational or "scientific" and behavioural approaches to international relations is the policies of the Taliban, Afghan and U.S. governments relevant to poppy production in Afghanistan. There are no bright lines which can be definitively determined as to which approach is being taken by which stakeholder. Both rational and behavioural assessments are being made; where the effective result is that Afghan poppy production has risen since the U.S. invasion theguardian.com/news/2018/jan/09/… – guest271314 Oct 14 '18 at 15:44
  • I agree with your explanation. That's what I understood for the first time but by reading literature i got confused. Because their explanation is unlike that. For example. Behavioral approach is defined as an approach that focuses on actions and interactions among units by using scientific methods of observation to include quantification of variables whenever possible. I read the same definition of scientific approach at another place. – Saif ullah Minhas Oct 14 '18 at 19:15
  • @SaifullahMinhas For a practical analysis of international relations from a tenured actor in actual geopolitics, instead of political theory published by academia which may or may not be implemented in the field, you might be interested in reviewing The Grand Chessboard: American Primacy and Its Geostrategic Imperatives by Zbigniew Brzezinski (1997) – guest271314 Oct 14 '18 at 19:27
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    OP asks about comparing two things: a "scientific approach" and a "behavioral approach". Your answer describes a "rational approach" and a "behavioral approach". It just makes me wonder if your section on the rational approach is supposed to address their question about a scientific approach. It's not intended as a criticism of your answer at all, I just suspect that your vocabulary here is different than mine and I want to appreciate your answer more. – indigochild Jan 8 at 17:09
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    @indigochild Yes, the "rational approach" at the answer is an approximate characterization of a "scientific approach". Again, bright lines are difficult if not impossible to define outside of a particular instructors' classroom. The demands and dynamics on the ground do not permit the principals to pause in the middle of execution of policy aims in order to determine if the approach they are using is strictly "scientific" or "behavioral" according to an academic or think tank white paper. Even academics could disagree as to if actions are consistent with a given definition. – guest271314 Jan 8 at 17:14
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In political science, behavioralism was a theory which attempted to bring a more scientific approach to the field. In a lot of ways, their work was an attempt to subject political science to the kinds of methods used in the natural sciences.

Much of this information is based on my graduate seminars, where we talked about the history and development of the discipline. I'll add references where I can, but if you feel like something needs more support just say so and I'll try to dig it up.

Early Political Science

Early political science was not very scientific. The discipline was organized around the time of World War I. Many early political scientists were diplomats, government officials, and lawyers with expertise in comparative or international law. They had normative goals of ensuring international stability.

Behavioralism

Around the 1930s there was strong movement to make political science scientific.Their notion of 'scientific' was an approach that was based on quantitative hypothesis-testing. The predominant theory of this time was behavioralism which focused on the behavior of individuals.

One example is the 'Easton model' (also referred to under the broader names of systems theory or cybernetic theory). Easton proposed that the policy environment could be understood at the "inputs" to a person and observing the output. There is feedback in this relationship because the person's decisions influence the inputs for other decisions.

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  • "Early political science was not very scientific. The discipline was organized around the time of World War I" Do the academic institutions that provided your training consider The Art of War by Sun Tzu, or Discourses on the First Decade of Titus Livius or The Prince by Niccolo Machiavelli not to be studies in political science proper? – guest271314 Jan 8 at 17:22
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    @guest271314 No. They come up in political theory (philosophy) courses, but they aren't works of science. I'm not familiar with any one in the empirical side of political science considering them scientific. This could be regional. I think the European departments place study politics as part of the humanities, and they may have a different opinion. – indigochild Jan 8 at 17:27

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