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This policy brief focuses on a particular program, the Healthy Identity Intervention (HII), which was specifically designed to prevent extremist offenders from reoffending and was based on general whatworks principles. It centers on the opinions, reflections, and experiences of the author, who designed, developed, and implemented this intervention across the Prison and Probation Services of England and Wales. It therefore provides a unique perspective on the issues raised and specifically outlines: (1) insight into the apparent generalizability and utility of what-works principles for P/CVE programs, (2) insight into specific program components or issues that may contribute to or undermine efficacy, and (3) suggested what-works principles to specifically inform effective P/CVE programs. The main intention is to provide a set of transparent working principles to improve the design and delivery of programs that can hopefully be examined and tested over time to help refine our knowledge and understanding.