BehavePlus is a PC application to predict wildland fire behavior for fire management purposes. It is designed for use by wildland fire managers who are familiar with fuels, weather, topography, wildland fire situations, and associated terminology. BehavePlus uses site-specific input data to predict fire behavior for a point in time and space. The BehavePlus Fire Modeling System replaces the 1984 BEHAVE Fire Behavior Prediction and Fuel Modeling System (Andrews 1986, Andrews and Chase 1989, Burgan and Rothermel 1984) with a new computation engine and graphical user interface. Currently, BehavePlus uses essentially the same mathematical models as the original BEHAVE. Future versions of BehavePlus will incorporate additional fire models. Users are responsible for supplying valid input, correctly interpreting the fire behavior predictions, and understanding the assumptions and limitations of the models used in BehavePlus.