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Developed by His Majesty's Prison and Probation Service (HMPPS) Counter Terrorism\u2010Assessment and Rehabilitation Centre (CT\u2010ARC), the ERG\u2010R responds to key shifts in the terrorism landscape, including the growth of online radicalization, greater involvement of younger individuals, an increase in extreme right\u2010wing convictions, and more fluid ideological affiliations. The revised framework comprises 36 factors, building on the original three dimensions (engagement, intent, and capability) by adding a fourth dimension addressing protective and risk\u2010mitigating factors, enhancing alignment with Structured Professional Judgment (SPJ) methodology. Its development drew on a comprehensive literature review, consultation with the Correctional Services Advice and Accreditation Panel (CSAAP), external peer review, and a 12\u2010month pilot across custodial and community settings. The ERG\u2010R enhances operational guidance for assessing dynamic risk, including tracking change over time and informing case prioritization, replacing fixed risk levels with more nuanced case management. Following practitioner training, the ERG\u2010R was formally implemented across HMPPS in March 2025. This technical report outlines its theoretical foundations, development process, and practical application and considers its adaptability to jurisdictions beyond England and Wales.<\/jats:p>","DOI":"10.1111\/1556-4029.70101","type":"journal-article","created":{"date-parts":[[2025,5,28]],"date-time":"2025-05-28T00:53:54Z","timestamp":1748393634000},"page":"2031-2041","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Adapting risk assessments to a changing terrorism landscape: Revising the extremism risk guidance"],"prefix":"10.1111","volume":"70","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5122-523X","authenticated-orcid":false,"given":"Jonathan","family":"Kenyon","sequence":"first","affiliation":[{"name":"Counter Terrorism Assessment and Rehabilitation Centre His Majesty's Prison and Probation Service  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam J.","family":"Carter","sequence":"additional","affiliation":[{"name":"Counter Terrorism Assessment and Rehabilitation Centre His Majesty's Prison and Probation Service  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sian","family":"Watson","sequence":"additional","affiliation":[{"name":"Counter Terrorism Assessment and Rehabilitation Centre His Majesty's Prison and Probation Service  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jenty","family":"Farr","sequence":"additional","affiliation":[{"name":"Counter Terrorism Assessment and Rehabilitation Centre His Majesty's Prison and Probation Service  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,5,27]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1037\/tam0000035"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/lcrp.12140"},{"key":"e_1_2_11_4_1","unstructured":"WebsterS KerrJ TompkinsC.A process evaluation of the structured risk guidance for extremist offenders. 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