# Protocol: Interventions to Prevent Cognitive and Behavioural Violent Radicalisation: A Systematic Review and Multilevel Meta‐Analysis: A Systematic Review

## TL;DR

This paper reviews interventions to prevent or reduce violent radicalization and terrorism, focusing on what works and under what conditions.

## Contribution

The study introduces a systematic review and multilevel meta-analysis to evaluate interventions against violent radicalization.

## Key findings

- The review will assess the effectiveness of interventions in reducing cognitive and behavioral radicalization.
- It will identify factors like participant characteristics and intervention features that influence outcomes.
- The goal is to determine which strategies are most effective for specific groups and contexts.

## Abstract

This review aims to systematically evaluate the available evidence on the effectiveness of various interventions aimed at reducing violent radicalisation and terrorism. Quantitative analysis will be employed to assess the overall impact and identify the factors that influence it. The key research questions are: (1) What interventions are successful (A successful intervention will be defined as one that effectively reduces cognitive radicalisation (e.g., extremist beliefs or ideological commitment), reduces behavioural radicalisation (e.g., intentions or actions related to violent extremism), prevents at‐risk individuals from becoming radicalised (counter‐radicalisation), or facilitates the disengagement and de‐radicalisation of individuals already involved in extremist activities or networks) in preventing or reducing violent radicalisation and terrorism? (2) Are certain preventive strategies more effective than others? (3) How do participants' characteristics influence programme outcomes? (4) How do the features of interventions, their implementation, and methodologies impact the effectiveness of terrorism prevention? The review will conduct analyses considering participant characteristics (e.g., age, gender, risk level), intervention components (e.g., theoretical foundations, theory of change), implementation (e.g., facilitator training, dosage), and methodological aspects (e.g., study design). The goal is to identify the most effective interventions, the target groups they work for, and the conditions under which they are most successful.