Community Engagement for Disaster Risk Reduction (CEDRR) v2

This protocol documents a longitudinal mixed-methods household engagement study conducted in two flood-prone metropolitan municipalities in Victoria, Australia. The study examines how reported learning processes and reported flood risk adaptation co-occur over time under the conditions created by a dialogic, non-directive household engagement that is treated analytically as an intervention rather than a neutral survey instrument. Households were engaged at two timepoints using a combination of structured survey items and open-ended qualitative prompts. Baseline engagements focused on participants’ flood experience, risk perceptions, existing adaptations, and household context. Follow-up engagements conducted four to six months later elicited participants’ reflections on the engagement, reported learning, reported implementation of flood risk adaptations, and reported spillover to non-participants. Learning was coded across three analytically distinct domains cognitive, normative, and relational and adaptation and spillover were coded using predefined binary criteria based on participants’ qualitative accounts. The within-subjects longitudinal design allows examination of associations between reported learning, reported adaptation, and reported spillover within the same households over time, while recognising explicit limits on causal inference arising from the absence of an untreated control group and contemporaneous measurement at follow-up. The protocol details recruitment, engagement procedures, coding rules, and analytic strategies to support transparency and reproducibility in household-scale disaster risk reduction research.