The field of Counter-Terrorism and Preventing/Countering Violent Extremism (CT and P/CVE) is in need of more evidence-based evaluations. The current underdevelopment and underutilisation of evaluations makes it difficult to understand what works, for whom, in what circumstances, and how. This lack of evidence increases the risk of (unintentionally) reproducing ineffective or counterproductive interventions and hampers CT and P/CVE practices. This is why ICCT established its Monitoring and Evaluation (M&E) Centre of Excellence.