Interventions are the levers of counselling, intended to trigger concrete, positive change in clients’ lives. Building on Grawe’s impact research, the chapter highlights core effectiveness factors—clear goals, resource activation, problem mastery and a strong councelling alliance. A diverse catalogue of systemic techniques is offered, encouraging counsellors to craft a context-sensitive, personally resonant method repertoire. Illustrations derive from practice in both ‘Islamist’ and right-wing extremism work. Readers are invited to test these tools while adhering to the quality-assurance principles and expert insights presented in the subsequent sections.