The present work employs a utilization-focused evaluation perspective to ask the big question regarding so-called deradicalization programs: how to evaluate the degree to which a given terrorism risk reduction initiative reduces post-detainment terrorism engagement. Its dual objectives are: (a) to provide a roadmap for conducting such an impact analysis with a utilization-focus, and (b) to highlight some of the unique challenges (both methodologically and theoretically) that face evaluators in the context of evaluating terrorism risk reduction initiatives. Additionally, the appendices of this work contain both a process checklist for conducting an impact analysis of such initiatives, and an evaluation self-assessment tool.