Can you model growth of trust? A study of the sustainability of a rural community health centre in north India )>IJH=?J Trust in the service provided by any health facility is of vital importance to its sustainability, whether it is a community clinic in a rural area of a developing country or an international telemedicine service. Community health centres can be used as a means of delivering highly accessible, low-cost health service in the developing world. A major strategic issue for planners of such centres is the expected level of uptake of services throughout a region and its eect on sustainability of any facility. In this study of a clinic in rural north India, Monte Carlo simulation is used in modelling the spatiotemporal spread of usage of the service. Trust in the provider is built both through word-of-mouth contacts and previous development activities: our study contributes to the literature with a practical application of trust modelling.keywords(trust; sustainability; Monte Carlo simulation; OR for developing countries; OR for health service; word-of-mouth spread)