Table 7 What this study adds to current knowledge

• Making explicit one’s intervention theory helps to fill a research gap by producing knowledge on how the components and processes of tailor-made interventions are linked to their outcomes

• This study confirms the methodological feasibility of a deliberative intervention that relies on videos and scenarios to enable productive deliberations among non-experts

• Our findings help understand why face-to-face and online deliberations need to be combined if the goal is to increase deliberative depth and foster learning across groups