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Reply to Dunoff and Pollack: ‘Experimenting with International Law’

Published on April 4, 2018        Author:  and

In the last issue of the European Journal of International Law we published an experimental study on the ability of international law students and experts to ignore information in the context of treaty interpretation. The same issue included a follow-up article by Jeffrey Dunoff and Mark Pollack. We find Dunoff and Pollack’s practical exercise of critically reading experimental studies important and helpful in moving the broader methodological and theoretical concerns into a concrete discussion of actual studies. In the following sections, we will try to contribute to this effort by reflecting on their assessment of our study.

The Study

Before delving into Dunoff and Pollack’s discussion of our paper, we would like to briefly summarize our study, which one of us also summarized in this EJIL:Live! interview. Our study was designed to empirically test a notion that has been mentioned in the treaty interpretation literature, which suggests that it is practically impossible to ignore the content of preparatory work after exposure, even when a rule prohibits the use of such material. This notion is supported by studies on the difficulty of ignoring information in other legal contexts, such as exposure to inadmissible evidence. To test this notion’s validity, we conducted three experiments that examined the ability of international law students and experts to ignore information about preparatory work while interpreting treaties. Our findings indicate that experts are better able than students to ignore preparatory work when they believe that the Vienna Convention on the Law of Treaties (VCLT) rules on treaty interpretation do not allow the use of such information. This suggests that there is something unique about international law expertise (or legal expertise in general) that enables the experts to resist the effect of exposure to such information. Read the rest of this entry…