Thyne, Clayton L. (2012) Information, Commitment, and Intra-War Bargaining: The Effect of Governmental Constraints on Civil War Duration. International Studies Quarterly, doi: 10.1111/j.1468-2478.2012.00719.x © 2012 International Studies Association This article considers how governmental variations affect the duration of civil conflicts. Recent work suggests that war termination is likely when competing actors gain information about the power balance and are able to credibly commit to war-ending agreements. I focus on how the strength and stability of executives impact these factors. Regarding information, power consolidation within the government reduces the number of people who must agree on a settlement, which should shorten civil conflicts. Stable leadership should likewise shorten conflicts by making it harder for potential spoilers to derail war-ending agreements, helping minimize credibility problems. This argument is tested by examining how variations in institutional design (executive constitutional and legislative power), political strength (ideological fragmentation and polarization), and stability (leadership tenure) affect the duration of civil conflicts from 1946 to 2004. The results suggest that powerful and stable executives are indeed well equipped to end civil conflicts.