Integrated Contact Theory
Intergroup contact is a continuum of different forms of programs that are based on the interaction of people from various social groups, including horizontal contact (between racial, ethnic, religious, and/or national groups) and vertical contact (between communities, civic society government, police and representatives of other institutions).
Integrated contact theory provides tools and practices in four main areas:
1. Improving the process of the contact programming, including the four conditions for contact, and the 3Ts: trust building, threat reduction, and trauma healing.
2. Improving dynamics of horizontal contacts (between ethnic, religious groups, victims/ former paramilitary, and communities), including deep work, different forms of identity work, and the 3-stage categorization process.
3. Improving dynamics of vertical contacts (between communities and government, police, etc.), including radical storytelling and bridging conceptual barriers.
4. Improving project management, including theories of change (TOCs), inclusion, sustainability, and improvement in communication.

Applications
Conditions
Download White Papers:
Conditions
Download white papers on processes
Improving applications of contact programs
- Horizontal contact programming
- Vertical contact programming
Download white papers on improving applications
More White Papers on Contact Theory
Contact Theory Library
Foundational and conceptual readings on reconciliation and peacebuilding- Pettigrew, T.F. (1998). Integrated Contact Theory. Personality and Social Psychology Bulletin, 49, 65–85. [https://rcid.carterschool.gmu.edu/wp-content/uploads/2025/06/Pettigrew-Intergroup-Contact-Theory.pdf]
- d’Estrée, T. P. (2024). Exploring reconciliation’s identity paradoxes. In T. P. d’Estrée (Ed.), Shifting Protracted Conflict Systems Through Local Interactions: Extending Kelman’s Legacy (Chapter 14). Routledge. [https://rcid.carterschool.gmu.edu/wp-content/uploads/2025/06/dEstree-2024-14_chapter-Reconcil.pdf]
- Lederach, J. P. (1997). Reconciliation: The building of relationships. In Building Peace: Sustainable Reconciliation in Divided Societies (Chapter 10). United States Institute of Peace Press. [https://rcid.carterschool.gmu.edu/wp-content/uploads/2025/06/Lederach-1997-Ch.-10.pdf]
- OECD (2012). Understanding and evaluating theories of change. In Evaluating Peacebuilding Activities in Settings of Conflict and Fragility: Improving Learning for Results (Annex B). OECD Publishing. [https://rcid.carterschool.gmu.edu/wp-content/uploads/2025/06/OECD-Understanding-Evaluating-Theories-of-Change.pdf]
- Tropp, L. R., Abellera, C., Schreiber, J. A., Uluğ, Ö. M., & Burrows, B. (in press). Expanding intergroup contact research beyond prejudice reduction: Implications for diversity, inclusion, belonging, and support for equality. In V. Esses et al. (Eds.), Sage Handbook of Psychological Perspectives on Diversity, Equity, and Inclusion. [https://lindatropp.com/media/pages/lab/academic-publications/d6d96d2318-1735348274/tropp-abellera-schreiber-ulug-burrows-dei-handbook-chapte-as-of-9-2024.pdf]
- Tropp, L. R., Morhayim, L., & Grigoryan, L. (in press). How social categorization shapes intergroup contact: Implications for understanding group members’ subjective experiences and prospects for achieving attitude generalization. In T. D. Nelson (Ed.), Handbook of Prejudice, Stereotyping, and Discrimination (3rd ed.). Routledge. [https://lindatropp.com/media/pages/lab/academic-publications/d7b6ecdf24-1735348273/tropp-morhayim-grigoryan-handbook-chapter-in-press-as-of-11-2024.pdf]
- Schreiber, J. A., Tropp, L. R., & Uluğ, Ö. M. (2024). Comparing the roles of positive and supportive intergroup contact on social cohesion and social change. Translational Issues in Psychological Science, 10(1), 21–34. [https://lindatropp.com/media/pages/lab/academic-publications/faa6c07be2-1735348279/schreiber-tropp-ulug-tps-2024-positive-and-supportive-contact.pdf]
- Tropp, L. R., & Dehrone, T. A. (2023). Prejudice reduction and social change: Dual goals to be pursued in tandem. In L. Huddy et al. (Eds.), Oxford Handbook of Political Psychology (3rd ed., pp. 1062–1094). Oxford University Press. [https://lindatropp.com/media/pages/lab/academic-publications/7b9641dbc5-1735348281/tropp-and-dehrone-2023-prejudice-reduction-and-social-change-oxford-handbook-of-political-psychology-opt.pdf]
- Paolini, S., White, F. A., Tropp, L. R., et al. (2021). Intergroup contact research in the 21st century: Lessons learned and forward progress. Journal of Social Issues, 77, 11–37. [https://lindatropp.com/media/pages/lab/academic-publications/3e2c1f3e2d-1735348289/paolini-white-tropp-turner-page-gould-barlow-gomez-2021-introduction-to-jsi-contact-issue.pdf]
- Tropp, L. R., & Barlow, F. K. (2018). Making advantaged racial groups care about racial inequality. Current Directions in Psychological Science, 27, 194–199. [https://lindatropp.com/media/pages/lab/academic-publications/1eeaf6f002-1735348287/tropp-l-r-barlow-f-k-2018.pdf]
- Tropp, L. R., & Molina, L. (2019). Intergroup processes: From prejudice to positive relations between groups. In K. Deaux & M. Snyder (Eds.), Oxford Handbook of Personality and Social Psychology (2nd ed., pp. 621–643). Oxford University Press. [https://lindatropp.com/media/pages/lab/academic-publications/11cd561a58-1735348273/tropp-and-molina-2019-oxford-handbook-chapter_compressed.pdf]
- Tropp, L. R., Mazziotta, A., & Wright, S. C. (2017). Recent developments in intergroup contact research. In C. Sibley & F. K. Barlow (Eds.), Cambridge Handbook of the Psychology of Prejudice (pp. 463–480). Cambridge University Press. [https://lindatropp.com/media/pages/lab/academic-publications/fb51b6c4f9-1735348304/tropp-mazziotta-wright-chapter-2017.pdf]
- Tropp, L. R. (2015). Dismantling the ethos of conflict: Strategies for improving intergroup relations. In E. Halperin & K. Sharvit (Eds.), The Social Psychology of Intractable Conflicts (pp. 159–171). Springer. [https://lindatropp.com/media/pages/lab/academic-publications/18dd09af47-1735348267/tropp-chapter-conflict-and-strategies-for-improving-group-relations.pdf]
- Tropp, L. R., & Page-Gould, E. (2014). Contact between groups. In M. Mikulincer et al. (Eds.), APA Handbook of Personality and Social Psychology, Volume 2 (pp. 535–560). American Psychological Association. [https://lindatropp.com/media/pages/lab/academic-publications/682b7064ba-1735348265/tropp-and-page-gould-apa-handbook-chapter.pdf]
- Hassler, T., Ullrich, J., Bernardino, M., Shnabel, N., Van Laar, C., Valdenegro, D., Sebben, S., Tropp, L. R., Visintin, E. P., Gonzalez, R., Ditlmann, R., Abrams, D., et al. (2020). A large-scale test of the link between intergroup contact and support for social change. Nature Human Behavior. [https://lindatropp.com/media/pages/lab/academic-publications/4b8f62f161-1735348293/hassler-t-ullrich-j-bernardino-m-shnabel-n-van-laar-c-valdenegro-d-sebben-s-tropp-l-r-et-al-multinational-pathways.pdf]
- Hayward, L., Tropp, L. R., Hornsey, M., & Barlow, F. (2017). Toward a comprehensive understanding of intergroup contact: Descriptions and mediators of positive and negative contact among majority and minority groups. Personality and Social Psychology Bulletin, 43, 347–364. [https://lindatropp.com/media/pages/lab/academic-publications/a61a635122-1735348294/hayward-l-e-tropp-l-r-hornsey-m-j-barlow-f-k-2018.pdf]
- Davies, K., Tropp, L. R., Aron, A., Pettigrew, T. F., & Wright, S. C. (2011). Cross-group friendships and intergroup attitudes: A meta-analytic review. Personality and Social Psychology Review, 15, 332–351. [https://lindatropp.com/media/pages/lab/academic-publications/77d269b271-1735348296/davies-k-tropp-l-r-aron-a-pettigrew-t-f-wright-s-c-2011.pdf]
- Page-Gould, E., Mendoza-Denton, R., & Tropp, L. R. (2008). With a little help from my cross-group friend: Reducing anxiety in intergroup contexts through cross-group friendship. Journal of Personality and Social Psychology, 95, 1080–1094. [https://lindatropp.com/media/pages/lab/academic-publications/84464db2c4-1735348289/page-gould-e-mendoza-denton-r-tropp-l-r-2008.pdf]
- Pettigrew, T. F., & Tropp, L. R. (2008). How does intergroup contact reduce prejudice? Meta-analytic tests of three mediators. European Journal of Social Psychology, 38, 922–934. [https://lindatropp.com/media/pages/lab/academic-publications/722d2dcab7-1735348289/pettigrew-t-f-tropp-l-r-2008.pdf]
- Pettigrew, T. F., & Tropp, L. R. (2006). A meta-analytic test of intergroup contact theory. Journal of Personality and Social Psychology, 90, 751–783. [https://lindatropp.com/media/pages/lab/academic-publications/5f31f72ec8-1735348299/pettigrew-tropp-meta-analytic-test.pdf]
- Tropp, L. R., & Pettigrew, T. F. (2005). Relationships between intergroup contact and prejudice among minority and majority status groups. Psychological Science, 16, 951–957. [https://lindatropp.com/media/pages/lab/academic-publications/e662abd067-1735348300/tropp-pettigrew-2005-intergroup-contact-prejudice.pdf]
- Tropp, L. R., & Pettigrew, T. F. (2005). Differential relationships between intergroup contact and affective and cognitive indicators of prejudice. Personality and Social Psychology Bulletin, 31, 1145–1158. [https://lindatropp.com/media/pages/lab/academic-publications/3f72787c67-1735348300/tropp-pettigrew-2005-differential-relationships.pdf]
- Morhayim, L., Tropp, L. R., & Maloku, E. (2024). Examining beliefs about reconciliation and social integration in Kosovo: Testing effects of interethnic contact and differences in perspective among ethnic Albanians and Serbs. European Journal of Social Psychology, 54(1), 48–65. [https://lindatropp.com/media/pages/lab/academic-publications/0450163bc4-1735348278/morhayim-tropp-maloku-2024-beliefs-about-reconciliation-in-kosovo-ejsp.pdf] (Kosovo)
- Burrows, B., Tropp, L. R., Dehrone, T., & Cehajic-Clancy, S. (2022). How intergroup contact shapes intergroup attitudes and construals of relations between ethnic groups: Evidence from Bosnia and Herzegovina. Peace and Conflict: Journal of Peace Psychology, 28, 372–383. [https://lindatropp.com/media/pages/lab/academic-publications/d783f6c230-1735348279/burrows-tropp-dehrone-cehajic-clancy-2022-peace-and-conflict.pdf] (BiH)
- Dehrone, T., Tropp, L. R., Burrows, B., & Bilali, R. (2022). Coming together after genocide: How openness to communication about conflict shapes prospects for social integration in post-genocide Rwanda. Peace and Conflict: Journal of Peace Psychology, 28, 384–396. [https://lindatropp.com/media/pages/lab/academic-publications/24b0458f27-1735348280/dehrone-tropp-burrows-bilali-ginn-2022-peace-and-conflict.pdf] (Rwanda)
- Dehrone, T., Burrows, B., Tropp, L. R., Bilali, R., & Morrisson, G. (2022). Twubakane: Contact-based programs to strengthen social cohesion in post-genocide Rwanda. In A. Nordstrom & W. Goodfriend (Eds.), Innovative Stigma and Discrimination Reduction Programs (pp. 87–100). Taylor & Francis. [https://lindatropp.com/media/pages/lab/academic-publications/24b0458f27-1735348280/dehrone-tropp-burrows-bilali-ginn-2022-peace-and-conflict.pdf] (Rwanda)
- Ünver, H., Güler, M., Cakal, H., & Tropp, L. R. (2022). Support for rights of Syrian refugees in Turkey: The role of secondary transfer effects in intergroup contact. Journal of Community and Applied Social Psychology, 32, 153–171. [https://lindatropp.com/media/pages/lab/academic-publications/c8d6985e1e-1735348279/unver-cakal-guler-tropp-2022-jcasp-secondary-transfer-effects-and-support-for-rights-of-syrian-refugees-in-turkey-opt.pdf] (Turkey)
- Tropp, L. R., Okamoto, D. G., Marrow, H. B., & Jones-Correa, M. (2018). How contact experiences shape welcoming: Perspectives from U.S.-born and immigrant groups. Social Psychology Quarterly, 81, 23–47. [https://lindatropp.com/media/pages/lab/academic-publications/cf05372171-1735401808/tropp-okamoto-marrow-jones-correa-contact-and-welcoming-spq-2018.pdf] (USA)
- Knowles, E., & Tropp, L. R. (2018). The racial and economic context of Trump support: Evidence for threat, identity, and contact effects in the 2016 Presidential Election. Social Psychological and Personality Science, 9, 275–284. [https://lindatropp.com/media/pages/lab/academic-publications/012fe72656-1735348292/knowles-e-tropp-l-r-2018.pdf] (USA)
- Tropp, L. R., Hawi, D., O’Brien, T. C., Gheorghiu, M., Zetes, A., & Butz, D. (2017). Intergroup contact and the potential for post-conflict reconciliation: Studies in South Africa and Northern Ireland. Peace and Conflict: Journal of Peace Psychology, 23, 239–249. [https://lindatropp.com/media/pages/lab/academic-publications/23afb0958f-1735348286/tropp-l-r-hawi-d-obrien-t-c-gheorghiu-m-zetes-a-butz-d-2017.pdf] (Northern Ireland and South Africa)
- Kende, A., Tropp, L. R., & Lantos, N. (2017). Testing a contact intervention based on intergroup friendship between Roma and non‐Roma Hungarians: Reducing bias through institutional support in a non‐supportive societal context. Journal of Applied Social Psychology, 47, 47–55. [https://lindatropp.com/media/pages/lab/academic-publications/a6d9f1e96c-1735348292/kende-a-tropp-l-r-lantos-n-2017.pdf] (Hungary)
- Orosz, G., Banki, E., Bothel, B., Toth-Kiraly, I., & Tropp, L. R. (2016). Don’t judge a living book by its cover: Effectiveness of the Living Library intervention in reducing prejudice toward Roma and LGBT people. Journal of Applied Social Psychology, 46, 510–517. [https://lindatropp.com/media/pages/lab/academic-publications/e0b6dbf0ec-1735348290/orosz-g-banki-e-bothel-b-toth-kiraly-tropp-l-r-2016.pdf] (Hungary)
The BRIDGE framework

The BRIDGE Framework systemically describes strategies that create a foundation for sustainable peace. Bonding strategies create mutuality, the interdependency of positive change, and the ability to find common ways forward. Through Reassuring strategies, the identities of the parties involved become recognized, respected, and accounted for as a crucial part of a peace process. Involving strategies stress the importance of involving a wide array of actors and activities of all sectors of society.
Determining Guides strategy concentrates on the core issues of identity dynamics within each party and between parties involved, emphasizing the diversity of views on just peace within the society and the need to account for all positions in the production of a common language of peace. Equalizing strategies address not only power differences between parties but also a variance between conflict sides’ perspectives on what justice might entail.
To get more information on practices, and tactics related to each of the five strategies, please click HERE.
Early warning system for identity-based conflicts
The dynamics of identity-based conflict are outlined in the 4-C model, consisting of four stages: Comparison, Competition, Confrontation, and Counteraction (Korostelina, 2007). Members of interactive communities possess multiple identities leading to the formation of stereotypes, biases, and prejudices even in peaceful and cooperative societies. Unfavorable perceptions of outgroups stem from various psychological processes, including a need to be both different from others and included in a group, favorable group comparisons and intergroup prejudice, relative deprivation, and the global attribution error. In conflicts of interests, negative intergroup perceptions and ingroup favoritism can transform into active hostility toward the outgroup. This collective angst is based on perceived threats from outgroups, even among those who did not directly experience violence. Thus, social identity is employed to make sense of the situation of competition, exclusion, and marginalization. Once a society is divided into antagonistic groups, social identities become central to the conflict, creating moral boundaries and collective axiology that dehumanizes and demonizes outgroup members as well as prescribes actions against the outgroup.