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Disturbance Response Groups (DRGs) are used to scale up ecological sites by grouping ecological sites based on abiotic and biotic similarities and disturbance ecology of the Reference plant community.� The disturbance response focus in group building facilitates the development of a modal state-and-transition model (STM) for the DRG that is refined through field investigations and for each individual member or ecological site contained in the DRG.� This method of STM development and refinement provides an expedited, scientifically sound process for creating robust, field tested, conceptual STMs that can be up-scaled to the DRG level or down-scaled to individual ecological sites.� Furthermore, the process follows guidance provided by the USDA, NRCS National Ecological Site Handbook (2014) and subsequent Title 306 National Instructions (2015) for STM development for Provisional Ecological Sites.� This methodology has successfully completed Disturbance Response Groups in Nevada for MLRA 23, 24, 25, 26, 27, 28A, 28B and 29 and on Oregon�s Crooked River Grasslands (MLRA B10). �State-and-transition models are available for the Crooked River Grasslands and MLRA 24, 25, 28A, and 28B with draft models available for MLRA 23 within Nevada.