When collecting data, some observations will always be hard to confidently classify in accordance with stated definitions of war, civil conflict, or political violence. This research note draws on the experiences of the Uppsala Conflict Data Program in the last decade in managing such unclear...

This article extends the Uppsala Conflict Data Program (UCDP) by presenting new global data on non-state conflict, or armed conflict between two groups, neither of which is the state. The dataset includes conflicts between rebel groups and other organized militias, and thus serves as a...