eprintid: 10193739 rev_number: 9 eprint_status: archive userid: 699 dir: disk0/10/19/37/39 datestamp: 2024-06-24 14:51:38 lastmod: 2024-06-24 14:51:38 status_changed: 2024-06-24 14:51:38 type: article metadata_visibility: show sword_depositor: 699 creators_name: LaFree, Gary creators_name: Gill, Paul title: Strengths and Weaknesses of Open Source Data for Studying Terrorism and Political Radicalization ispublished: inpress divisions: UCL divisions: B04 divisions: C05 divisions: F52 keywords: Open source data; terrorism; political radicalization; databases note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. abstract: Compared to studying other forms of illegal violence, terrorism research faces unique data challenges. Notably, consistent police data are generally lacking, victims often have no direct knowledge of attacks and are sometimes killed, and perpetrators are difficult to interview and are often unreliable sources. In the face of these data challenges, the increasing availability of open source data on terrorist attacks and perpetrators has profoundly affected the scientific study of terrorism. Over time, a growing proportion of published academic research on terrorism—especially more heavily quantitative studies—relies on open source data. Moreover, the growing availability of individual-level terrorism data has allowed empirical tests of psychological and social-psychological theories of radicalization. In this paper, we assess the impact of open source data on the study of terrorism. We begin with an overview, providing a brief history of terrorist attack and perpetrator open source data bases. We then consider the major strengths and weaknesses of both types of open source data and suggest ways of countering the weaknesses. We close with observations about the impact of open source data on terrorism research and future opportunities for improvement. date: 2024-06-05 date_type: published publisher: Informa UK Limited official_url: http://dx.doi.org/10.1080/1057610x.2024.2361948 full_text_type: other language: eng verified: verified_manual elements_id: 2284436 doi: 10.1080/1057610X.2024.2361948 lyricists_name: Gill, Paul lyricists_id: PGILL80 actors_name: Gill, Paul actors_id: PGILL80 actors_role: owner full_text_status: restricted publication: Studies in Conflict & Terrorism issn: 1057-610X citation: LaFree, Gary; Gill, Paul; (2024) Strengths and Weaknesses of Open Source Data for Studying Terrorism and Political Radicalization. Studies in Conflict & Terrorism 10.1080/1057610X.2024.2361948 <https://doi.org/10.1080/1057610X.2024.2361948>. (In press). document_url: https://discovery.ucl.ac.uk/id/eprint/10193739/1/Gill_Draft%20Opensource_July7_2023.jpg.pdf