LANDFIRE fuel and fire regime products are based almost entirely on various combinations of existing and potential vegetation themes. Since LANDFIRE National's initial release in 2008, a number of revisions to these themes have been implemented both from a mapping and a classification standpoint. In addition, a large amount of additional inventory plot data have been brought to bear on many of the LANDFIRE mapping processes. This presentation will highlight methods used to develop and adjust the LANDIRE existing and potential vegetation classifications and improve the mapping related to these themes. In addition, the presentation will summarize the amount and nature of the inventory data used in this process and outline future mapping methods that leverage these data to better reflect local conditions. Presented at the Fifth International Fire Ecology and Management Congress: Uniting Research, Education, and Management; hosted by the Association for Fire Ecology, Dec. 5, 2012, Portland, Oregon. Part of the concurrent session: LANDFIRE: Data Products and Methods.