RT Article T1 Assessing the Validity of Open-Source Biographical Data in Terrorism Research JF Terrorism and political violence VO 37 IS 6 SP 815 OP 833 A1 Kanol, Eylem A1 Hirth, Maria-Anna 1992- A2 Hirth, Maria-Anna 1992- LA English YR 2025 UL https://krimdok.uni-tuebingen.de/Record/1933281952 AB A multitude of studies in terrorism research depend on biographical data gathered through the cliometric method. This technique entails reconstructing and aggregating demographic and socio-economic data on terrorism offenders from publicly accessible sources. A notable limitation of this method is the substantial number of missing values. Researchers often employ this data collection strategy as comprehensive official sources are not publicly accessible and are rarely provided to researchers due to privacy concerns, among other factors. In this study, we analyze original data on 53 convicted Islamist terrorism offenders, collected from both publicly available media data and court records. We concentrate on and compare a number of demographic, socio-economic, and biographic variables. The insights derived from these analyses hold important implications for the reliability of biographical research that relies on open-source data. K1 court files K1 Biographical research K1 terrorism data K1 data validity K1 Open-source data DO 10.1080/09546553.2024.2376631