Discusses the relationship between community infrastructure and health through the development of the Community Resource Accessibility Index (CRAI) research tool.This area-based index of community services, facilities, and amenities enables comparisons between opportunity structures in the local environment and residents' health and wellbeing. It is based on six domains: recreational amenities, public transport and communication, shopping and banking facilities, educational services, health services, and social and cultural services. (Contains references.) (SM)