Department of Peace and Conflict Research


The Uppsala Conflict Data Program (UCDP) is the world’s main provider of data on organized violence and the oldest ongoing data collection project for civil war, with a history of almost 40 years. Its definition of armed conflict has become the global standard of how conflicts are systematically defined and studied.

Contact the UCDP

  • Introduction to UCDP Definitions of Organized Violence

  • How to Use the UCDP Encyclopedia (

  • Lecture on Peace Research by Peter Wallensteen