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Part I - Concepts, Definitions, and Trends

Published online by Cambridge University Press:  31 October 2025

Milan Obaidi
Affiliation:
University of Copenhagen
Jonas Kunst
Affiliation:
BI Norwegian Business School
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References

Abrahms, M. (2010, February 10). Lumpers versus splitters: A pivotal battle in the field of terrorism studies. Cato Unbound: A Journal of Debate. www.cato-unbound.org/2010/02/10/max-abrahms/lumpers-versus-splitters-pivotal-battle-field-terrorism-studies/Google Scholar
Aron, R. (2003). Peace and war: A theory of international relations. Transaction Books. (Originally published in French in 1966)Google Scholar
Berger, J. M. (2018). Extremism. MIT Press.CrossRefGoogle Scholar
Bötticher, A., & Mares, M. (2012). Extremismus. Theorien – Konzepte – Formen. Oldenbourg Verlag.Google Scholar
Coolsaet, R. (2019). Radicalisation: The origins and limits of a contested concept. In Fadil, N., Ragazzi, F., & de Koning, M. (Eds.), Radicalisation in Belgium and the Netherlands: Critical perspectives on violence and security (pp. 2952). I. B. Tauris.Google Scholar
Corrado, R., Wössner, G., & Merari, A. (Eds.). (2021). Terrorist risk assessment instruments: Contemporary policy and law enforcement challenges. IOS Press.CrossRefGoogle Scholar
Craiutu, A. (2017). Faces of moderation: The art of balance in an age of extremes. University of Pennsylvania Press.Google Scholar
Crenshaw, M. (2019). The debate over “old” vs. “new” terrorism. In Coolsaet, R. (Ed.), Jihadi terrorism and the radicalisation challenge: European and American experiences (2nd ed., pp. 5768). Ashgate.Google Scholar
Duyvestein, I. (2012). How new is the new terrorism? In Horgan, J. & Braddock, K. (Eds.), Terrorism studies: A reader (pp. 4160). Routledge.Google Scholar
Encyclopedia Britannica. (1976). 15th ed.Google Scholar
European Commission, Expert Group on Violent Radicalisation. (2008, May 15). Radicalisation processes leading to acts of terrorism. www.clingendael.org/sites/default/files/pdfs/20080500_cscp_report_vries.pdfGoogle Scholar
European Council. (2004, June 15). Plan of action on combating terrorism (No. 10586/04). Coreper. https://data.consilium.europa.eu/doc/document/ST-10586-2004-INIT/en/pdfGoogle Scholar
Fletcher, G. P. (2006). The indefinable concept of terrorism. Journal of International Criminal Justice, 4(5), 894911. https://doi.org/10.1093/jicj/mql060CrossRefGoogle Scholar
Hofmann, W. (1962). Ideengeschichte der sozialen Bewegung des 19. und 20. Jahrhunderts. Walter de Gruyter & Co.CrossRefGoogle Scholar
Hudson, R. A. (Ed.). (2002). Who becomes a terrorist and why: The 1999 government report on profiling terrorists. The Lyons Press.Google Scholar
Law, R. D. (2016). Terrorism: A history (2nd ed.). Polity Press.Google Scholar
Marshall, M. G., & Gurr, T. R. (2005). Peace and conflict. University of Maryland, Center for International Development & Conflict Management.Google Scholar
McNeil-Willson, E., Triandafyllidou, A., & Gerrand, V. (Eds.). (2023). Violent extremism and resilience in the 21st century. Routledge.CrossRefGoogle Scholar
Midlarsky, M. I. (2011). Origins of political extremism: Mass violence in the twentieth century and beyond. Cambridge University Press.CrossRefGoogle Scholar
Nietzsche, F. (1995). On the genealogy of morals. In Kaufmann, W. (Trans.), Basic writings of Nietzsche (pp. 437600). Modern Library. (Originally published in 1887)Google Scholar
Pressman, D. E., & Flockton, J. (2014). Violent extremist risk assessment: Issues and applications of the VERA-2 in a high-security correctional setting. In Silke, A. (Ed.), Prisons, terrorism and extremism: Critical issues in management, radicalisation and reform (pp. 122143). Routledge.Google Scholar
Rapoport, D. C. (2022). Waves of global terrorism: From 1879 to the present. Colombia University Press.Google Scholar
Reidy, K. (2018). The accidental ambassadors: Implications of benevolent radicalisation (Doctoral dissertation). University of Northumbria.Google Scholar
Rubin, B., & Rubin, J. C. (2008). Chronologies of modern terrorism. M. E. Sharpe.Google Scholar
Russell, C. A., & Miller, B. H. (1977, August). Profile of a terrorist. Military Review, 57(8), 2134.Google Scholar
Schmid, A. P. (1984). Political terrorism: A research guide to concepts, theories, data bases and literature (with a bibliography by the author and a world directory of “terrorist” organizations by A. J. Jongman). North-Holland.Google Scholar
Schmid, A. P. (1992). The definition of terrorism (a study in compliance with CTL/9/91/2207 for the UN Crime Prevention and Criminal Justice Branch). Centre for the Study of Social Conflict.Google Scholar
Schmid, A. P. (Ed.). (2011). The Routledge handbook of terrorism research. Routledge.Google Scholar
Schmid, A. P. (2013). Radicalisation, de-radicalisation, counter-radicalisation: A conceptual discussion and literature review. ICCT.Google Scholar
Schmid, A. P. (2014). Violent and non-violent extremism: Two sides of the same coin? ICTT.Google Scholar
Schmid, A. P. (2017a). Moderate Muslims and Islamist terrorism: Between denial and resistance. ICCT.Google Scholar
Schmid, A. P. (2017b). Public opinion survey data to measure sympathy and support for Islamist terrorism: A look at Muslim opinions on Al Qaeda and IS. ICCT.Google Scholar
Schmid, A. P. (2018, May 25). Extremism & related terms: Are we, conceptually speaking, all on the same page? [Paper presentation]. Centre for Research on Extremism (C-REX), Oslo.Google Scholar
Schmid, A. P. (2020). Revisiting the wicked problem of defining terrorism. In Brunton, G. & Wilson, T. (Eds.), Terrorism: Its Past, Present & Future Study: A Special Issue to Commemorate CSTPV at 25. Contemporary Voices: St Andrews Journal of International Relations, 1(1), Article 2.Google Scholar
Schmid, A. P. (2021). Foreword. In Corrado, R., Wössner, G., & Merari, A. (Eds.), Terrorist risk assessment instruments: Contemporary policy and law enforcement challenges (pp. ixxi). IOS Press.Google Scholar
Schmid, A. P. (2023). Defining terrorism. ICCT.Google Scholar
Schmid, A. P., & de Graaf, J. (1980). Insurgent terrorism and the Western news media: An exploratory analysis with a Dutch case study. COMT.Google Scholar
Scruton, R. (1996). A dictionary of political thought (2nd ed., pp. 351352). Macmillan.Google Scholar
Waterman, S. (2008, May 6). U.S. officials urged to avoid Islam, jihad with terrorism. United Press International.Google Scholar
Weinberg, L., Pedahzur, A., & Hirsch-Hoefler, S. (2004). The challenges of conceptualizing terrorism. Terrorism and Political Violence, 16(4), 777794. https://doi.org/10.1080/095465590899768CrossRefGoogle Scholar
Wintrobe, R. (2006). Radical extremism: The political economy of radicalism. Cambridge University Press.Google Scholar
Wurth, P. (1941). La repression internationale du terrorisme. La Concorde.Google Scholar

References

Arce, D. G., Croson, R. T., & Eckel, C. C. (2011). Terrorism experiments. Journal of Peace Research, 48(3), 373382. https://doi.org/10.1177/0022343310391502CrossRefGoogle Scholar
Bierwiaczonek, K., Fluit, S., von Soest, T., Hornsey, M. J., & Kunst, J. R. (2024). Loneliness trajectories over three decades are associated with conspiracist worldviews in midlife. Nature Communications, 15(1), Article 3629. https://doi.org/10.1038/s41467-024-47113-xGoogle ScholarPubMed
Bird, S., Klein, E., & Loper, E. (2009). Natural language processing with Python: Analyzing text with the natural language toolkit. O’Reilly Media, Inc.Google Scholar
Bridgelall, R. (2023). Identifying factors associated with terrorist attack locations by data mining and machine learning. International Social Science Journal, 73(248), 539557. https://doi.org/https://doi.org/10.1111/issj.12414CrossRefGoogle Scholar
DiMaggio, C., & Galea, S. (2006). The behavioral consequences of terrorism: A meta-analysis. Academic Emergency Medicine, 13(5), 559566. https://doi.org/https://doi.org/10.1197/j.aem.2005.11.083Google ScholarPubMed
Fluit, S., Kunst, J. R., Bierwiaczonek, K., & von Soest, T. (2023). Self-esteem trajectories over three decades predict opposition to social equality in midlife. Proceedings of the National Academy of Sciences, 120(1), e2212906120. https://doi.org/doi:10.1073/pnas.2212906120CrossRefGoogle ScholarPubMed
Godefroidt, A. (2023). How terrorism does (and does not) affect citizens’ political attitudes: A meta-analysis. American Journal of Political Science, 67(1), 2238. https://doi.org/https://doi.org/10.1111/ajps.12692Google Scholar
Goh, J. X., Hall, J. A., & Rosenthal, R. (2016). Mini meta-analysis of your own studies: Some arguments on why and a primer on how. Social and Personality Psychology Compass, 10(10), 535549. https://doi.org/https://doi.org/10.1111/spc3.12267CrossRefGoogle Scholar
Grootendorst, M., Fuetterer, H.-A., zilch42, Das, A., Inskip, C., Bailey, J. S., dschwalm, Elashry, A., Gamble, A., Simonoff, A., Mathew, A. T., Aratako, B., Pegueros, C., Kapitan, D., van Strien, D., Huang, D., Dai, D., Rosati, D., Liao, E., … & Oala, L. (2024). MaartenGr/BERTopic: v0.16.2 (v0.16.2). Zenodo. https://doi.org/10.5281/zenodo.11180915CrossRefGoogle Scholar
Haghish, E. F., Obaidi, M., Strømme, T., Bjørgo, T., & Grønnerød, C. (2023). Mental health, well-being, and adolescent extremism: A machine learning study on risk and protective factors. Research on Child and Adolescent Psychopathology, 51(11), 16991714. https://doi.org/10.1007/s10802-023-01105-5Google Scholar
Hamaker, E. L., Kuiper, R. M., & Grasman, R. P. P. P. (2015). A critique of the cross-lagged panel model. Psychological Methods, 20(1), 102116. https://doi.org/10.1037/a0038889CrossRefGoogle ScholarPubMed
Harpviken, A. N. (2020). Psychological vulnerabilities and extremism among Western youth: A literature review. Adolescent Research Review, 5(1), 126. https://doi.org/10.1007/s40894-019-00108-yCrossRefGoogle Scholar
Jongman, A. J., & Schmid, A. P. (1999). Trends in contemporary conflicts and human rights violations, 1998. Terrorism and Political Violence, 11(3), 119150. https://doi.org/10.1080/09546559908427520CrossRefGoogle Scholar
Koehler, D. (2021). Violent extremism, mental health and substance abuse among adolescents: Towards a trauma psychological perspective on violent radicalization and deradicalization. In Logan, C. (Ed.), Violent extremism: A primer for mental health practitioners (pp. 103120). Routledge.CrossRefGoogle Scholar
Kunst, J. R., Gundersen, A. B., Krysińska, I., Piasecki, J., Wójtowicz, T., Rygula, R., van der Linden, S., & Morzy, M. (2024). Leveraging artificial intelligence to identify the psychological factors associated with conspiracy theory beliefs online. Nature Communications, 15(1), 7497. https://doi.org/10.1038/s41467-024-51740-9CrossRefGoogle Scholar
Malone, I., Strouboulis, A., & National Counterterrorism Innovation, Technology, and Education Center. (2021). Predicting domestic extremism and targeted violence: A machine learning approach (NCITE Report No. 25). https://digitalcommons.unomaha.edu/ncitereportsresearch/25Google Scholar
McInnes, L., Healy, J., & Astels, S. (2017). hdbscan: Hierarchical density based clustering. Journal of Open Source Software, 2(11), Article 205. https://doi.org/10.21105/joss.00205Google Scholar
McInnes, L., Healy, J., & Melville, J. (2018). Umap: Uniform manifold approximation and projection for dimension reduction. arXiv preprint arXiv:1802.03426.Google Scholar
Nivette, A., Echelmeyer, L., Weerman, F., Eisner, M., & Ribeaud, D. (2022). Understanding changes in violent extremist attitudes during the transition to early adulthood. Journal of Quantitative Criminology, 38(4), 949978. https://doi.org/10.1007/s10940-021-09522-9CrossRefGoogle ScholarPubMed
Obaidi, M., Anjum, G., Bierwiaczonek, K., Dovidio, J. F., Ozer, S., & Kunst, J. R. (2023). Cultural threat perceptions predict violent extremism via need for cognitive closure. Proceedings of the National Academy of Sciences, 120(20), e2213874120. https://doi.org/doi:10.1073/pnas.2213874120Google ScholarPubMed
Obaidi, M., Kunst, J. R., Thomsen, L., & Sidanius, J. (2018). Living under threat: Mutual threat perception drives anti-Muslim and anti-Western hostility in the age of terrorism. European Journal of Social Psychology, 48(5), 567584. https://doi.org/doi:10.1002/ejsp.2362CrossRefGoogle Scholar
OpenAI. (n.d.). OpenAI API. https://www.openai.com/api/Google Scholar
Pedregosa, F., Varoquaux, G., Gramfort, A., Michel, V., Thirion, B., Grisel, O., Blondel, M., Prettenhofer, P., Weiss, R., Dubourg, V., Vanderplas, J., Passos, A., Cournapeau, D., Brucher, M., Perrot, M., & Duchesnay, É. (2011). Scikit-learn: Machine learning in Python. Journal of Machine Learning Research, 12, 28252830.Google Scholar
Ranstorp, M. (2006). Mapping terrorism research. Routledge.CrossRefGoogle Scholar
Ranstorp, M. (2009). Mapping terrorism studies after 9/11: An academic field of old problems and new prospects. In Jackson, R., Smyth, M. B., & Gunning, J. (Eds.), Critical terrorism studies: A new research agenda (pp. 2747). Routledge.Google Scholar
Rohrer, J. M. (2018). Thinking clearly about correlations and causation: Graphical causal models for observational data. Advances in Methods and Practices in Psychological Science, 1(1), 2742. https://doi.org/10.1177/2515245917745629CrossRefGoogle Scholar
Sageman, M. (2014). The stagnation in terrorism research. Terrorism and Political Violence, 26(4), 565580. https://doi.org/10.1080/09546553.2014.895649Google Scholar
Schuurman, B. (2019). Topics in terrorism research: Reviewing trends and gaps, 2007–2016. Critical Studies on Terrorism, 12(3), 463480. https://doi.org/10.1080/17539153.2019.1579777Google Scholar
Schuurman, B. (2020). Research on terrorism, 2007–2016: A review of data, methods, and authorship. Terrorism and Political Violence, 32(5), 10111026. https://doi.org/10.1080/09546553.2018.1439023CrossRefGoogle Scholar
Scrivens, R., Freilich, J. D., Chermak, S. M., & Frank, R. (2024). Data collection in online terrorism and extremism research: Strengths, limitations, and future directions. Studies in Conflict & Terrorism, 1–23. https://doi.org/10.1080/1057610X.2024.2361957Google Scholar
Sidanius, J., Kteily, N., Levin, S., Pratto, F., & Obaidi, M. (2016). Support for asymmetric violence among Arab populations: The clash of cultures, social identity, or counterdominance? Group Processes & Intergroup Relations, 19(3), 343359. https://doi.org/10.1177/1368430215577224CrossRefGoogle Scholar
Sidanius, J., & Pratto, F. (2001). Social dominance: An intergroup theory of social hierarchy and oppression. Cambridge University Press.Google Scholar
Silke, A. (2001). The devil you know: Continuing problems with research on terrorism. Terrorism and Political Violence, 13(4), 114. https://doi.org/10.1080/09546550109609697CrossRefGoogle Scholar
Silke, A. (2008). Research on terrorism. In Chen, H., Reid, E., Sinai, J., Silke, A., & Ganor, B. (Eds.), Terrorism informatics: Knowledge management and data mining for homeland security (pp. 2750). Springer US. https://doi.org/10.1007/978-0-387-71613-8_2CrossRefGoogle Scholar
The Pandas Development Team. (2024). pandas-dev/pandas: Pandas (v2.2.2). Zenodo. https://doi.org/10.5281/zenodo.10957263CrossRefGoogle Scholar
Vosgerau, J., Simonsohn, U., Nelson, L. D., & Simmons, J. P. (2019). 99% impossible: A valid, or falsifiable, internal meta-analysis. Journal of Experimental Psychology: General, 148(9), 16281639. https://doi.org/10.1037/xge0000663CrossRefGoogle ScholarPubMed
Wolfowicz, M., Litmanovitz, Y., Weisburd, D., & Hasisi, B. (2021). Cognitive and behavioral radicalization: A systematic review of the putative risk and protective factors. Campbell Systematic Reviews, 17(3), e1174. https://doi.org/10.1002/cl2.1174CrossRefGoogle ScholarPubMed
Young, J. K., & Findley, M. G. (2011). Promise and pitfalls of terrorism research. International Studies Review, 13(3), 411431. https://doi.org/10.1111/j.1468-2486.2011.01015.xGoogle Scholar

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  • Concepts, Definitions, and Trends
  • Edited by Milan Obaidi, University of Copenhagen, Jonas Kunst, BI Norwegian Business School
  • Book: The Cambridge Handbook of the Psychology of Violent Extremism
  • Online publication: 31 October 2025
  • Chapter DOI: https://doi.org/10.1017/9781009407892.002
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  • Concepts, Definitions, and Trends
  • Edited by Milan Obaidi, University of Copenhagen, Jonas Kunst, BI Norwegian Business School
  • Book: The Cambridge Handbook of the Psychology of Violent Extremism
  • Online publication: 31 October 2025
  • Chapter DOI: https://doi.org/10.1017/9781009407892.002
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Concepts, Definitions, and Trends
  • Edited by Milan Obaidi, University of Copenhagen, Jonas Kunst, BI Norwegian Business School
  • Book: The Cambridge Handbook of the Psychology of Violent Extremism
  • Online publication: 31 October 2025
  • Chapter DOI: https://doi.org/10.1017/9781009407892.002
Available formats
×