Summary On December 27, 2022, an article co-written by Masaaki Higashijima, associate professor at Tohoku University, and Yujin Woo, GGR research fellow and assistant professor at the Hitotsubashi University Graduate School of Law, was published in Tohoku University’s Interdisciplinary Information Sciences magazine. In the article, the authors review recent research on national refugee and asylum policies with the goal of introducing recent efforts made by scholars to quantitatively understand different countries’ adoptions of divergent policy tools. To do so, they review and compare extant data sets that quantitatively measure national refugee policies. Through this comparison, they conclude that future research should attempt to understand host countries’ refugee policies through a broader temporal and geographic scope.