Groups have a powerful influence on the behaviour of individuals through norms and values, modelling, and group identification. When the group becomes violent — whether it is gangs, organized crime, extremists, or even sports fans — there are unique and changing risk factors and systemic processes that need to be considered.

Unfortunately, there is no consensus or professionally accepted way to approach risk assessments for group-based violence. The challenge is that the research in this area is limited. And no surveys have been conducted on how professionals approach these assessments.

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