The LANDFIRE Program collaborated with experts across the country for more than a decade to create a unique product describing the characteristics and basic ecology of hundreds of ecosystems. This product, known as the Biophysical Settings (BpS) Descriptions and Models, consists of two components: 1) a quantitative state-and-transition model, and 2) a description document. The models are used by LANDFIRE to estimate reference conditions, which are used to calculate vegetation condition class and to map historical fire regimes. Beyond LANDFIRE, the models and descriptions have been used to assess vegetation conditions, quantify restoration need, perform scenario analysis, analyze biomass production, support Forest Plan revision and more. BpS descriptions are being reviewed now and for the next few months because vegetation changes and new science opens up missed opportunities and provides more accurate information. There are corrections to be made to the original descriptions, delivery methods are getting better, and modeling software is continually improving.