From the text...'A fire simulation system combines an underlying fire prediction model with a fire simulation technique. By categorizing the various types of fire prediction models and simulation techniques, we can identify the similarities and differences among the systems. The resulting classification scheme for fire simulation systems can enable fire managers and planners to compare the various systems and decide which ones best meet their needs. As components of fire simulation systems, fire prediction models simulate fire behavior (such as rate of spread, fire intensity, and flame height) using site-specific data such as weather, terrain, and fuel type and condition. A spreading fire releases energy from combustion and transports some of it to adjacent unburned fuels, heating them to the point of ignition (Albini 1985). Different fire prediction models use different predictive methods to quantify these fire spread processes. There are four different types of fire prediction models: physical, physical-statistical, statistical, and probablistic.'