A Fire Prevention Effectiveness Assessment for Multiple Ownerships Fire managers and policy makers have a variety of means of intervening in fire processes to reduce the long-run discounted sum of costs and losses from wildfire. These include preventing and suppressing wildfires, managing fuels, preparing for their eventual arrival by pre-positioning resources, and investing in new fire management technologies. Existing tools for allocating fire prevention funds are based on expert opinions, not landscape-level statistical analyses. The proposed research in this study seeks to develop and provide to wildland management organizations estimates of the statistical efficacy of fire prevention spending. Statistical estimates will be provided first from a nearly completed analysis of fire prevention efficacy in Florida and from a study of fires on national forests in three Forest Service regions (3, 4, 5), Bureau of Land Management districts in Utah, and Bureau of Indian Affairs units nationwide. Fire prevention specialists from each of the three Forest Service regions and the Bureaus of Land Management and Indian Affairs will assist in fire prevention activity and budget data gathering. Analysts in the Southern Research Station and the National Institute of Standards and Technology will gather additional statistical data needed to estimate national forest-level prevention effectiveness statistical models.