World Heritage conservation in developing countries is challenged by conflicting demands of preservation, economic development and social equity. Managing these demands requires monitoring of the dynamic interaction between natural environment, cultural heritage and contemporary society. Angkor, the great World Heritage site in Cambodia, epitomises the challenge. A joint Cambodian and international team will create a time-based, spatial information monitoring system for site management using Angkor as a test case. The new methodology integrates past and future research, community values, national policies and international heritage best-practise. Research, management and governance come together to reconcile the competing demands of living with heritage.