This report is the fourth in the Global Center’s “Blue Sky” series, following the 2012 report Reshaping United Nations Counterterrorism Efforts: Blue-Sky Thinking for Global Counterterrorism Cooperation 10 Years After 9/11”; the 2014 report “Blue Sky II: Progress and Opportunities in Implementing the UN Global Counter-Terrorism Strategy”; and the 2016 report “Blue Sky III: Taking UN counterterrorism Efforts in the Next Decade From Plans to Action