This is the protocol for a Campbell systematic review. The main objective is to explore the general efficacy of group‐based community interventions aimed at supporting marginalised adults with mental illness and related problems on outcomes such as problem behaviour, subjective well‐being, homelessness, poverty and employment. Furthermore, the objective is to explore the potential advantages/disadvantages of using a group‐based versus an individual intervention when targeting specific problems or when using specific types of interventions.
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