FIRE! is one example of GIS models that go beyond inventory, monitoring, and display to allow ecosystem managers to simulate the spatial outcomes of management and policy decisions. By making the ability to vary critical model assumptions readily accessible to the manager, FIRE! allows ecosystem managers to test the sensitivity of decisions to assumptions of weather, fuels, and topography. Future applications will allow the economic costs and benefits of those decisions to be considered by incorporating ignition risk, suppression costs and land value into the model. © Society of American Foresters, Bethesda, MD. Abstract reproduced by permission.