Fuel behavior maps have been constructed based on an analysis developed previously by the author. The maps enable one to see at a glance fuel behavior in transient parameter space as predicted by the model. The transient conditions under which fuel responds in either a brittle or ductile manner are defined within the context of the model and displayed in the maps. The nature and disposition of grain boundary fission gas, i.e., either contained in brittle cracks or equilibrium bubbles, at the time of fuel melting are also considered. Two general types of maps are constructed, each providing a different perspective on transient parameter space.