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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Publications

2014 l 2013 l 2012 l 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 20001999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | 1989 | 1988 | 1981

2014


  • Themnér, Lotta & Peter Wallensteen (2014) ‘Armed conflict, 1946-2013.’. Journal of Peace Research 51(4). 
  • Themnér, Lotta and Peter Wallensteen 2014. Patterns or organized violence, 2003-12, SIPRI Yearbook 2014: Armaments, Disarmament and International Security, Oxford University Press, pp 70-92.

2013


  • Sundberg, Ralph and Erik Melander, 2013, "Introducing the UCDP Georeferenced Event Dataset", Journal of Peace Research, July 2013, Vol.50, No.4, 523-532
  • Wallensteen, Peter 2013. J. David Singer and Systems Theory in Today’s World, pp. 260-265 in Geller, Daniel S. and Paul F. Diehl (eds). The Forum: Reflections and Reassessments on the Early Work and Ideas of J. David Singer, International Studies Review 15: 259-284.
  • Themnér, Lotta and Peter Wallensteen 2013. ‘Armed conflict, 1946-2012.’ Journal of Peace Research. Vol. 50 (4): 509-521.
  • Allanson, Marie, Margareta Sollenberg and Lotta Themnér 2013. 'Armed conflict in the wake of the Arab Spring' SIPRI Yearbook 2013. Oxford University Press, Chapter 1.I.
  • Themnér, Lotta and Peter Wallensteen 2013. ‘Patterns of organized violence, 2002-2011.’ SIPRI Yearbook 2013. Oxford University Press, Chapter 1.III. 

2012


  • Sundberg, Ralph, Kristine Eck and Joakim Kreutz, 2012, "Introducing the UCDP Non-State Conflict Dataset", Journal of Peace Research, March 2012, 49:351-362
  • Pettersson, Therése and Lotta Themnér, (eds.), 2012, States in Armed Conflict 2011, Uppsala University: Department of Peace and Conflict Research Report 99
  • 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
  • Themnér, Lotta and Peter Wallensteen, 2012, "Armed Conflicts, 1946-2011", Journal of Peace Research, 49(4), 565–575
  • Themnér, Lotta and Peter Wallensteen, 2012, " Patterns of organized violence, 2001–10", in Sipri Yearbook 2012, Oxford: Oxford University Press.
  • Allansson Marie, et al., " The first year of the Arab Spring." In Stockholm International Peace Research Institute SIPRI Yearbook 2012, Stockholm, Sweden
  • Baumann, Jonas, et al., "Organized violence in the Horn of Africa." In Stockholm International Peace Research Institute SIPRI Yearbook 2012, Stockholm, Sweden
  • Harbom, Lotta and Erika Forsberg, 2012 "Armed Conflict and Conflict Resolution in Africa, 1989-2007" in Thomas Ohlson (ed.), From Intra-state War to Durable Peace. Conflict and its Resolution in Africa after the Cold War, Dordrecht: Republic of Letters Publishing.  

2011


  • Pettersson, Therése and Lotta Themnér, (eds.), 2011, States in Armed Conflict 2010, Uppsala University: Department of Peace and Conflict Research
  • Themnér, Lotta and Peter Wallensteen, 2011, "Patterns of major armed conflict, 2001-2010", in Sipri Yearbook 2011, Oxford: Oxford University Press.
  • Themnér, Lotta and Peter Wallensteen, 2011, "Armed Conflicts, 1946-2010", Journal of Peace Research, 48(4)
  • Sundberg, Ralph, with Mike Spagat, Madelyn Hsiao-Rei Hicks and Uih Ran Lee, 2011, "Global Comparison of Warring Groups in 2002-2007: Fatalities from Targeting Civilians vs. Fighting Battles", PLoS ONE 6 (9)
  • Sundberg, Ralph and Lotta Themnér, "Systematic Data Collection: Experiences from the Uppsala Conflict Data Program", in Kristine Höglund & Magnus Öberg eds., Understanding Peace Research: Methods and Challenges, London and New York: Routledge, 2011. 
  • Strandow, Daniel, Michael Findley, Daniel Nielson, and Josh Powell. The UCDP and AidData codebook on georeferencing aid. Version 1.1 (2011), UCDP Paper Series no. 4.
  • Bjarnegård, Elin, and Erik Melander. 2011. "Disentangling Democratization, Gender, and Peace: The Negative Effects of Militarized Masculinity", Journal of Gender Studies 20(2):139-154.
  • Wallensteen, Peter. 2011. Understanding Conflict Resolution. (3rd Edition) Sage
  • Wallensteen, Peter. 2011. Peace Research - Theory and Practice. Routledge.
  • Wallensteen, Peter, 2011, “The Origins of Contemporary Peace Research", in Kristine Höglund & Magnus Öberg eds., Understanding Peace Research: Methods and Challenges, London and New York: Routledge, 2011.
  • Sollenberg, Margareta and Magnus Öberg, 2011, "Gathering Conflict Information Using News Resources”, in Kristine Höglund & Magnus Öberg eds., Understanding Peace Research: Methods and Challenges, London and New York: Routledge, 2011. 
  • Möller, Frida, 2011, "News Reports versus Written Narratives: Collecting information using different types of empirical sources", in Kristine Höglund & Magnus Öberg eds., Understanding Peace Research: Methods and Challenges, London and New York: Routledge, 2011. 
  • Möller, Frida, Karl DeRouen,Jr, Jacob Bercovitch and Peter Wallensteen. 2011. ‘The Limits of Peace: Third Parties in Civil Wars in Southeast Asia, 1993-2004.’ In Bercovitch, Jacob and Karl DeRouen,Jr (eds) Unraveling Internal Conflicts in East Asia and the Pacific. Lanham: Lexington Books, p 47-65.

2010


  • Pettersson, Therése and Lotta Themnér, (eds.), 2010, States in Armed Conflict 2009, Uppsala University: Department of Peace and Conflict Research
  • Johansson, Emma, Joakim Kreutz, Peter Wallensteen, Christian Altpeter, Sara Lindberg, Mathilda Lindgren, Ausra Padskocimaite. A New Start for EU Peacemaking? Past Record and Future Potential, UCDP Paper 7, (2010).    
  • Möller, Frida, Identifying Conflict Prevention Measures: Comparing Two Approaches, UCDP Paper 5, (2010).
  • Fjelde, Hanne, 2010, “Generals, Dictators and Kings: Authoritarian Regimes and Civil Conflict 1973 – 2004” Conflict Management and Peace Science (TBA)
  • Fjelde, Hanne, 2010, “Is the Hidden Hand an Iron Fist? Capitalism and Civil Conflict” Journal of Peace Research (TBA) With Indra de Soysa.
  • Fjelde, Hanne, 2010, ”Post-Conflict Democracy and Conflict Recurrence”. Ch. 8 in J. Joseph Hewitt, Jonathan Wilkenfeld &
  • Ted Robert Gurr (eds.), Peace and Conflict 2010 , London: Paradigm Publishers. With Håvard Hegre.
  • Harbom, Lotta and Peter Wallensteen, 2010, "Patterns of major armed conflict, 2000-2009", in Sipri Yearbook 2010, Oxford: Oxford University Press.
  • Harbom, Lotta and Peter Wallensteen, 2010, "Armed Conflicts, 1946-2009", Journal of Peace Research, 47(4)
  • Kreutz, Joakim, 2010, 'How and When Armed Conflicts End: Introducing the UCDP Conflict Termination Dataset,' Journal of Peace Research 47(2): 243-250.
  • Lindgren, Mathilda, Peter Wallensteen, and Helena Grusell. Meeting the New Challenges to International Mediation (2010).


2009


  • Brosché, Johan, 2009, ”Darfur – Dimensioner och dilemman i en komplex situation” i Konflikterna i Mellanöstern och Sudan– finns det lösningar? The Olof Palme International Center, (in Swedish) English title “Darfur – Dimensions and Dilemmas of a Complex Situation” in The Conflicts in the Middle East and Sudan are there any solutions?
  • Eck, Kristine, 2009, “From Armed Conflict to War: Ethnic Mobilization and Conflict Intensification.”, International Studies Quarterly, 53(2): 369-388
  • Fjelde, Hanne, 2009, “Buying Peace? Oil, Corruption and Civil War, 1984- 99.” Journal of Peace Research, 47(2): 199 – 218.
  • Fjelde, Hanne, 2009, “Coercion, Co-optation, or Cooperation? State Capacity and the Risk of Civil War, 1961–2004.” Conflict Management and Peace Science, 26(1): 5-25. With Indra de Soysa
  • Fjelde, Hanne, 2009, Sins of Omission and Commission. The Quality of Governance and Civil Conflict. Report No. 88, Dissertation, Department of Peace and Conflict Research, Uppsala University.
  • Harbom, Lotta and Peter Wallensteen, 2009, "Armed Conflicts, 1946-2008", Journal of Peace Research, 46(4)
  • Harbom, Lotta and Peter Wallensteen, 2009, "Patterns of major armed conflict, 1999-2008", in Sipri Yearbook 2009, Oxford: Oxford University Press
  • Harbom, Lotta and Ralph Sundberg, (eds.), 2009, States in Armed Conflict 2008, Uppsala University: Department of Peace and Conflict Research
  • Melander, Erik, 2009, "Selected to Go Where Murderers Lurk? The Preventive Effect of Peacekeeping on Mass Killings of Civilians." Conflict Management and Peace Sciences 26(4): 389-406
  • Melander, Erik, Frida Möller, and Magnus Öberg, 2009, "Managing Intrastate Low-intensity Armed Conflict 1993-2004: A New Dataset." International Interactions 35(2): 1-28
  • Melander, Erik, Magnus Öberg, et al., 2009, "Are 'New Wars' More Atrocious? Battle Intensity, Civilians Killed and Forced Migration Before and After the End of the Cold War." European Journal of International Relations 15(3): 505-536
  • Spagat, Michael, Andrew Mack, Tara Cooper, and Joakim Kreutz, 2009, “Estimating War Deaths: An Arena of Contestation”, Journal of Conflict Resolution 53(6): 934-950.
  • Sundberg, Ralph, 2009, "Revisiting One-sided Violence - A Global and Regional Analysis", UCDP Paper No.3, Uppsala University: Department of Peace and Conflict Research

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2008


  • Brosché, Johan (2008) Darfur - Dimensions and Dilemmas of a Complex Situation, UCDP Paper No. 2.
  • Eck, Kristine, 2008, “An Overview and Typology of Conflict Data: the Advantages of Data Diversity,” in Mayeul Kaufmann, (ed", Building and Using Datasets on Armed Conflicts, Vol. 36 NATO Science for Peace and Security Series. Amsterdam: IOS Press.
  • Harbom, Lotta and Ralph Sundberg, (eds.), (2008), States in Armed Conflict 2007, Uppsala University: Department of Peace and Conflict Research.
  • Harbom, Lotta, Erik Melander and Peter Wallensteen, (2008), "Dyadic Dimensions of Armed Conflict, 1946 - 2007", Journal of Peace Research, 45(5): 697-710
  • Harbom, Lotta and Peter Wallensteen (2008) “Patterns of major armed conflict, 1998-2007”, in Sipri Yearbook 2008, Oxford: Oxford University Press.
  • Kreutz, Joakim, 2008, “Calling a conflict a conflict: violence and other aspects of war”, in Kauffmann, Mayeul (ed.), Building and Using Datasets on Armed Conflicts. Vol. 36 NATO Science for Peace and Security Series. Amsterdam: IOS Press.
  • Wallensteen, Peter & Möller, Frida "Svensk forskning kan förebygga väpnade konfliker", Tvärsnitt nr 3:2008
  • Wallensteen, Peter and Frida Möller, (2008) "Third Parties in Conflict Prevention: A Systematic Look", in Mellbourn, Anders (ed.), Conflict Prevention and Third Parties

2007


  • Brosché, Johan, "New Sudan, Old Sudan or Two Sudan? - A review of the implementation of the Comprehensive Peace Agreement”, Journal of African Policy Studies, Volume 13 No. 1, 2007 pp. 27-61
  • Eck, Kristine and Lisa Hultman (2007) “One-Sided Violence Against Civilians in War: Insights from New Fatality Data.” Journal of Peace Research 44(2): 233-246.
  • Harbom, Lotta, (ed.), States in Armed Conflict 2006. Uppsala University: Department of Peace and Research Report 79.
  • Harbom, Lotta and Peter Wallensteen (2007) "Armed Conflict 1989-2006", Journal of Peace Research 44(5): 623-634.
  • Harbom, Lotta and Peter Wallensteen (2007) “Pattern of major armed conflict, 1990-2006.” Sipri Yearbook 2007. Oxford: Oxford University Press.
  • Kreutz, Joakim (2007) “Colombia” In DeRouen, Jr, Karl and Uk Heo Civil Wars of the World: Major Conflicts since World War II. Santa Barbara: ABC-Clio.
  • Kreutz, Joakim (2007) “Myanmar (Burma)” In DeRouen, Jr, Karl and Uk Heo Civil Wars of the World: Major Conflicts since World War II, volume II. Santa Barbara: ABC-Clio.
  • Möller, Frida, Karl DeRouen, Jacob Bercovitch and Peter Wallensteen (2007) "The Limits of Peace. Third Parties in Civil Wars in Southeast Asia, 1993-2004", Negotiation Journal 23(4).NB. This is an electronic version of an article published in Negotiation Journal complete citation information for the final version of the paper, as published in the print edition of Negotiation Journal, is available on the Blackwell Synergy online delivery service, accessible via the journal’s website at www.blackwellpublishing.com/nejo or http://www.blackwell-synergy.com
  • Wallensteen, Peter (2007) Understanding Conflict Resolution: War, Peace and the Global System, 2nd revised Edition. London: Sage.

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2006


  • Hall, Jonathan, Erik Melander and Magnus Öberg (2006) The ‘New Wars’ Debate Revisited: An Empirical Evaluation of the Atrociousness of ‘New Wars” Uppsala Peace Research Papers No. 9. Uppsala: Department of Peace and Conflict Research, Uppsala University, 2006.
  • Harbom, Lotta, (ed.), States in Armed Conflict 2005. Uppsala University: Department of Peace and Research Report 34.
  • Harbom, Lotta, Stina Högbladh and Peter Wallensteen (2006) “Armed Conflict and Peace Agreements.” Journal of Peace Research 43(5): 617-631.
  • Harbom, Lotta and Peter Wallensteen (2006) “Pattern of major armed conflict, 1990-2005.” Sipri Yearbook 2006. Oxford: Oxford University Press.
  • Kreutz, Joakim "The Nexus of Democracy, Conflict and the Targeting of Civilians, 1989-2005” in Harbom, Lotta, (ed.), 2006. States in Armed Conflict 2005. Uppsala: Department of Peace and Conflict Research.

2005


  • Eck, Kristine. A beginner's guide to conflict data. Finding the right dataset. UCDP Papers No 1.
  • Eck, Kristine. “Getting it Wrong: the ‘Urban myth’ About Civilian War Deaths.” In Human Security Centre. The Human Security Report 2005. New York: Oxford University Press.
  • Harbom, Lotta, (ed.), States in Armed Conflict 2004. Uppsala University: Department of Peace and Research Report 71.
  • Harbom, Lotta and Peter Wallensteen. “Armed Conflict and Its International Dimensions, 1946-2004.” Journal of Peace Research 42(5):623-635
  • Harbom, Lotta and Peter Wallensteen. “Pattern of major armed conflict, 1990-2004.” Sipri Yearbook 2005. Oxford: Oxford University Press.
  • Kreutz, Joakim. “Collective Violence in 2004: Human Insecurity in the Horn of Africa.” In Harbom, Lotta, (ed.), States in Armed Conflict 2004. Uppsala University: Department of Peace and Research Report 71.
  • Möller, Frida and Peter Wallensteen. "Mot fred i det euroeiska rummet? Konflikttrender i Europa, Mellanöstern, Afrika och Centralasien 1989-2003", Krisberedskapsmyndighetens (KBM) temaserie 2005:12

2004


  • Eck, Kristine, Margareta Sollengberg, and Peter Wallensteen. “One-Sided Violence and Non-State Conflict.” In Harbom, Lotta, (ed.), States in Armed Conflict 2003. Uppsala University: Department of Peace and Conflict Research Report 70.
  • Eck, Kristine. “Collective Violence in 2002 and 2003.” In Harbom, Lotta, (ed.), States in Armed Conflict 2003. Uppsala University: Department of Peace and Conflict Research Report 70.
  • Eriksson, Mikael and Peter Wallensteen. “Armed Conflict, 1989-2003.” Journal of Peace Research 41(5): 625-636.
  • Eriksson, Mikael and Peter Wallensteen. “Patterns of major armed conflict, 1990-2003.” In Sipri Yearbook 2004. Oxford: Oxford University Press.
  • Eriksson, Mikael, (ed.), States in Armed Conflict 2002. Uppsala: Uppsala Publishing House.
  • Harbom, Lotta, (ed.), States in Armed Conflict 2003. Uppsala University: Department of Peace and Conflict Research Report 70.
  • Högbladh, Stina. “Definitions of the Database Variables.” In Eriksson, Mikael (ed.), States in Armed Conflict 2002. Uppsala: Uppsala Publishing House.
  • Wallensteen, Peter. “The Uppsala Conflict Data Program 1978-2003: How it all began, how it matured and where it is today.” In Eriksson, Mikael, (ed.), States in Armed Conflict 2002. Uppsala: Uppsala Publishing House.

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2003


  • Eriksson, Mikael, Margareta Sollenberg, and Peter Wallensteen. “Armed Conflict 1989-2002.” Journal of Peace Research 40(5): 593-607.
  • Eriksson, Mikael, Margareta Sollenberg, and Peter Wallensteen. “Patterns of major armed conflict, 1990-2002.” In Sipri Yearbook 2003. Oxford: Oxford University Press.
  • Wallensteen, Peter and Frida Möller. Conflict Prevention: Methodology for Knowing the Unknown. Uppsala University: Uppsala Peace Research Papers 7.

2002


  • Eriksson, Mikael, (ed.), States in Armed Conflict 2001. Uppsala University: Department of Peace and Conflict Research Report 63.
  • Eriksson, Mikael, Margareta Sollenberg, and Peter Wallensteen (2002) “Patterns of major armed conflict, 1990-2001.” In Sipri Yearbook 2002. Oxford: Oxford University Press.
  • Gleditsch, Nils Petter, Peter Wallensteen, Mikael Eriksson, Margareta Sollenberg, and Håvard Strand. ”Armed Conflict 1946-2001: A New Dataset.” Journal of Peace Research 39(5): 615-637.
  • Granberg, Kristina, Kristine Eck and Peter Wallensteen 2002. Identifying Wars: Systematic Conflict Research and Its Utility in Conflict Resolution and Prevention: Executive Summary, International Conference on Conflict Data held at Uppsala University 2001.
  • Wallensteen, Peter. Understanding Conflict Resolution: War, Peace and the Global System. London: Sage.

2001


  • Sollenberg, Margareta, (ed.), States in Armed Conflict 2000. Uppsala University: Department of Peace and Conflict Research Report 60.
  • Sollenberg, Margareta and Peter Wallensteen. “Major Armed Conflicts, 2000.” In Sipri Yearbook 2001. Oxford: Oxford University Press.
  • Wallensteen, Peter and Margareta Sollenberg. “Armed Conflict 1989-2000.” Journal of Peace Research 38(5): 629-644.

2000


  • Sollenberg, Margareta, (ed.), States in Armed Conflict 1999. Uppsala University: Department of Peace and Conflict Research Report 55.
  • Sollenberg, Margareta, Ylva Blondel, Ann-Sofi Jakobsson Hatay, Andrés Jato, Thomas Ohlson, Peter Wallensteen, and Staffan Ångman. “Major Armed Conflicts 1999.” In Sipri Yearbook 2000. Oxford: Oxford University Press.
  • Wallensteen, Peter and Margareta Sollenberg. “Armed Conflict 1989-99.” Journal of Peace Research 37(5): 635-649.

1999


  • Sollenberg, Margareta, (ed.), (1999) States in Armed Conflict 1998. Uppsala University: Department of Peace and Conflict Research Report 54.
  • Sollenberg, Margareta, Ylva Blondel, Ann-Sofi Jakobsson, Andrés Jato, and Staffan Ångman (1999) “Major Armed Conflicts 1998.” In Sipri Yearbook 1999. Oxford: Oxford University Press.
  • Wallensteen, Peter and Margareta Sollenberg (1999) “Armed Conflict 1989-98.” Journal of Peace Research 36(5): 593-606.

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1998


  • Sollenberg, Margareta, (ed.), States in Armed Conflict 1997. Uppsala University: Department of Peace and Conflict Research Report 49.
  • Wallensteen, Peter and Margareta Sollenberg. “Armed Conflict and Regional Conflict Complexes, 1989-97.” Journal of Peace Research 35(5): 621-634.
  • Sollenberg, Margareta, Ramses Amer, Carl Johan Åsberg, Ann-Sofi Jakobsson, and Andrés Jato. “Major Armed Conflicts 1997.” In Sipri Yearbook 1998. Oxford: Oxford University Press.

1997


  • Sollenberg, Margareta, (ed.), States in Armed Conflict 1996. Uppsala University: Department of Peace and Conflict Research Report 46.
  • Sollenberg, Margareta, Ramses Amer, Carl Johan Åsberg, Birger Heldt, and Ann-Sofi Jakobsson. “Major Armed Conflicts 1996.” In Sipri Yearbook 1997. Oxford: Oxford University Press.
  • Wallensteen, Peter and Margareta Sollenberg. “Armed Conflict, Conflict Termination and Peace Agreements, 1989-96.” Journal of Peace Research 34(3): 339-358.

1996


  • Sollenberg, Margareta, (ed.), States in Armed Conflict 1995. Uppsala University: Department of Peace and Conflict Research Report 43.
  • Sollenberg, Margareta, Ramses Amer, Carl Johan Åsberg, Margareta Eliasson, Mary Jane Fox, Ann-Sofi Jakobsson, Kjell-Åke Nordquist, Thomas Ohlson, Anna Schnell, and Peter Wallensteen. “Major Armed Conflicts 1995.” In Sipri Yearbook 1996. Oxford: Oxford University Press.
  • Wallensteen, Peter and Margareta Sollenberg. “The End of International War? Armed Conflict 1989-95.” Journal of Peace Research 33(3): 353-370.

1995


  • Sollenberg, Margareta, (ed.), States in Armed Conflict 1994. Uppsala University: Department of Peace and Conflict Research Report 39.
  • Sollenberg, Margareta, Ramses Amer, Carl Johan Åsberg, Birger Heldt, Ann-Sofi Jakobsson, Kjell-Åke Nordquist, Thomas Ohlson, and Anna Schnell. “Major Armed Conflicts 1994.” In Sipri Yearbook 1995. Oxford: Oxford University Press.
  • Wallensteen, Peter and Margareta Sollenberg. “After the Cold War: Emerging Patterns of Armed Conflict 1989-94.” Journal of Peace Research 32(3): 345-360.

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1994


  • Axell, Karin, Birger Heldt, Erik Melander, Kjell-Åke Nordquist, Thomas Ohlson, and Carl Åsberg. “Major Armed Conflicts 1993.” In Sipri Yearbook 1994. Oxford: Oxford University Press.
  • Nordlander, Ylva, (ed.), States in Armed Conflict 1993. Uppsala University: Department of Peace and Conflict Research Report 38.
  • Wallensteen, Peter and Karin Axell. “Conflict Resolution and the end of the Cold War, 1989-93.” Journal of Peace Research 31(3): 333-349.
  • Wallensteen, Peter. "Conflictos contemporáneos." In Sánchez, Jesús A., Fransisco A. Muñoz, Fransisco J. Rodríguez, and Fransisco Jiménez, (eds.), Paz y prosepectiva: problemas globales y futuro de la humanidad. Granada: Universidad de Granada.

1993


  • Axell, Karin, (ed.), States in Armed Conflict 1992. Uppsala University: Department of Peace and Conflict Research Report 36.
  • Heldt, Birger and Erik Melander. “Major Armed Conflicts, 1992.” In Sipri Yearbook 1993. Oxford: Oxford University Press.
  • Heldt, Birger, (ed.), States in Armed Conflict 1990-91. Uppsala University: Department of Peace and Conflict Research Report 35.
  • Wallensteen, Peter and Karin Axell. “Armed Conflict at the end of the Cold War, 1989-92.” Journal of Peace Research 30(3): 331-346.
  • Wallensteen, Peter. "The United Nations in Armed Conflict: An Overview." In Dupuy, René-Jean, (ed.), The Development of the Role of the Security Council: Hague Academy of International Law Workshop 1992. Dordrecht: Martinus Nijhoff Publishers

1992


  • Wallensteen, Peter. "Global Patterns of Conflict and The Role of Third Parties." Notre Dame Law Review 67(5): 1409-1431.

1991


  • Ahlström, Christer and Kjell-Åke Nordquist. "Casualties of Conflict." Report for the World Campaign for the Protection of Victims of War. Uppsala: Department of Peace and Conflict Studies.
  • Lindgren, Karin, (ed.), States in Armed Conflict 1989. Uppsala University: Department of Peace and Conflict Research Report 32.

1989


  • Wallensteen, Peter, (ed.), States in Armed Conflict 1988. Uppsala University: Department of Peace and Conflict Research Report 30.

1988


  • Wilson, G. Kenneth and Peter Wallensteen. Major Armed Conflicts in 1987. Uppsala University: Department of Peace and Conflict Research Report 28.

1981


  • Wallensteen, Peter. "Patterns of Armed Conflict Since 1945: An Overview and Some Implications." Report for the Independent Commission on Disarmament and Security Issues. Uppsala: Department of Peace and Conflict Studies.

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Latest News

The UCDP’s latest data on armed conflicts in 2013 now released

The data on armed conflicts 1946-2013 will be presented in an article by Lotta Themnér and Peter Wallensteen in the July issue of Journal of Peace Research (JPR).

Press release (in Swedish)

Press release (in English)

UCDP/PRIO Armed Conflict Dataset v.4-2014, 1946 – 2013

UCDP Dyadic Dataset v. 1-2014, 1946 - 2013

UCDP Battle-Related Deaths Dataset v.5-2014, 1989-2013

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