About UCDP

The Uppsala Conflict Data Program (UCDP) has recorded ongoing violent conflicts since the 1970s. The data provided is one of the most accurate and well-used data-sources on global armed conflicts and its definition of armed conflict is becoming a standard in how conflicts are systematically defined and studied.

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Lecture on Peace Research by Peter Wallensteen

The Department has recorded a lecture on the origins and developments of peace research globally and at Uppsala University with Professor Peter Wallensteen.

Watch the lecture.

UCDP Peace Agreement Dataset

UCDP Peace Agreement Dataset v. 2.0, 1975-2011

Content: The new Peace Agreement dataset, that covers peace agreements signed between at least two opposing primary warring parties in an armed conflict 1975-2011. The dataset is compatible with the UCDP Dyadic Dataset v. 1-2012, and UCDP/PRIO Armed Conflict Dataset v.4-2012. It has been constructed to allow researchers to analyze the different peace agreements. The unit of analysis is the peace agreement; consequently more than one agreement can be registered for one conflict- or dyad-year in the UCDP data. Each agreement is categorized as a comprehensive agreement, a partial agreement or a peace process agreement, depending on if the agreement is seen as a final product in a peace process or if the parties still have outstanding issues that have to be solved. Each agreement is also attributed with conflict, dyad and actor IDs from the other UCDP data to enhance the merging of different UCDP data collections.The UCDP Peace Agreement Dataset includes information on e.g. name, date, signatories and third parties of the agreement. Furthermore, it contains information on the provisions of the accords as well as different variables concerned with the termination of violence. 

Latest citation of the data: Högbladh, Stina, 2011. ”Peace agreements 1975-2011 - Updating the UCDP Peace Agreement dataset”, in Pettersson Therése & Lotta Themnér (eds.), 2012, States in Armed Conflict 2011, Uppsala University: Department of Peace and Conflict Research Report 99

Original citation of the data: Harbom, Lotta, Stina Högbladh and Peter Wallensteen. 2006. “Armed Conflict and Peace Agreements.” Journal of Peace Research 43(5).



Latest update: 17 December 2012

Older versions

UCDP Peace Agreement Dataset v. 1.0, 1989-2005



Replication Data 

Harbom, Lotta, Stina Högbladh & Peter Wallensteen (2006) Armed Conflict and Peace Agreements. Journal of Peace Research 43(5): 617-631

UCDP Peace Agreement replication Dataset v. 1.0, 1989-2005

Codebook UCDP Peace Agreement replication Dataset v. 1.0

Organized violence 2014


“Organized Violence in the World 2015. An Assessment by the Uppsala Conflict Data Program”

In June, UCDP reported that the number of fatalities in armed conflict has increased substantially in recent years, and that 2014 was the most lethal year since the end of the Cold War for this category of violence. New data show that also the other two types of violence analyzed by the UCDP – conflict between non-state actors and violence targeting civilians – increased substantially in 2014.

Read the full report


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