32 Include community-building efforts after the scoping stage but before the start of detailed planning of the initiative. Citizen science projects can best engage citizens in science and policy if their activities are playful, simple, visible, personal, and practical. Have dedicated ‘community engagement and outreach’ officials to spot citizen initiatives and leverage for their adoption. B P 33 35 34 Behaviour Policy C Cities Citizen Science CS B CS B CS P B CS P C