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Executive SummaryThe Biomass Scenario Model (BSM) is a system dynamics model developed by the U.S. Department of Energy (DOE) as a tool to better understand the interaction of complex policies and their potential effects on the biofuels industry in the United States. However, it does not currently have the capability to account for allocation of biomass resources among the various end uses, which limits its utilization in analysis of policies that target biomass uses outside the biofuels industry. This report provides a more holistic understanding of the dynamics surrounding the allocation of biomass among uses that include traditional use, wood pellet exports, bio-based products and bioproducts, biopower, and biofuels by (1) highlighting the methods used in existing models' treatments of competition for biomass resources; (2) identifying coverage and gaps in industry data regarding the competing end uses; and (3) exploring options for developing models of biomass allocation that could be integrated with the BSM to actively exchange and incorporate relevant information.The review of existing models (Section 2) provides an overview on how competing demands for biomass are currently represented; these models do not include the dynamic interaction among biomass end users as a primary focus. There are models that specifically deal with the competition for biomass, but they are predominantly optimization models either with a limited time horizon or an incomplete pool of competitors for biomass. In terms of the current industries that consume biomass resources (Section 3), it is clear that federal and state regulations are a critical driver of growth, as has been the case in the biopower and biofuels industries. It is conceivable that the wood pellet and bioproducts industries could consume a larger portion of the biomass resource pool in the future, but to what extent that occurs depends largely on domestic and foreign policies' promotion of these technologies. In order to more fully explore the competition for biomass resources, complementary modeling pathways are developed in Section 4. A basic, standalone system dynamics model that explicitly models ...