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Abstract
Large-scale development projects attract many participants in education, assessment, negotiation, planning, and impact mitigation processes. However, each potential user of a model of a project's impacts has different goals and incentives to participate in the process. Impact model users must be familiar with the potentials and limitations of impact models in order to select one and interpret the results for their purposes. This report summarizes the features, capabilities, and limitations of large-scale impact models and assesses the kinds of information produced and the differences in the techniques used in the estimation process.