A 28-year-old man from an urban slum in Mumbai attends a PHC with acute diarrhea and dehydration. The health worker provides oral rehydration therapy (ORT) and educates him on water sanitation, handwashing, and food hygiene. The patient recovers within 3 days. The health worker also identifies that 15 other families in the same slum have reported similar cases in the past week and organizes a community meeting to discuss water source contamination and collective action for repairs. Which aspect of primary health care is being exemplified in this scenario?