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The presentation evaluates the feasibility for life-cycle impact assessment to yield accurate, useful results for sound decision-making. The evaluation raises feasibility issues based on (1) inherent scale issues, e.g., spatial and temporal discontinuities, between LCA and most environmental processes; (2) disparities between LCA threshold and dose-response assumptions and actual environmental processes; (3) extensive use of value-based subjective judgment and opinion to create environmental categories, equivalency models, and scores; and (4) the current lack of systems to indicate whether real and relevant differences are identified. All of these issues limit or constrain the decisions that can be made solely from LCA.