Many fire management decisions and actions require the fire manager to estimate, as accurately as possible, how a forest fire will behave under defined burning conditions. The ultimate goal of fire behavior research is to provide simple, timely answers to the following questions (given an actual ignition or a simulated fire occurrence) for any specified fuel, weather, and topographic situation. What will be the head fire rate of spread? Will it be a high intensity or low intensity fire? Will it be a crown fire or surface fire? Is there a possibility of it 'blowing up'? The Canadian Forest Fire Danger Rating System (CFFDRS) represents the practical output of Forestry Canada's (formerly the Canadian Forestry Service) national program of fire behavior research.