side-by-side comparisons in selected issue areas, alternative futures analysis for three different scenarios and most issues, and conclusions on the comparative viability of the SPS technology. The issue areas used for comparisons were (1) cost and performance, (2) health and safety, (3) environmental welfare, (4) resources, (5) macro- economic and socioeconomic, and (6) institutional. The comparisons were performed for technologies that are at different stages of development — current, near-term, and advanced — and which therefore have different degrees of information available (e.g., actual vs. projected construction data). Table 1 lists experience and uncertainty levels for the technologies evaluated in this assessment. Capital cost uncertainty factors and cost uncertainty issues are also listed. These cost uncertainty factors were developed on the basis of existing relevant documentation and on the judgments of the assessment participants. As stated earlier, the information presented and developed in these comparisons has been derived from published research and information found in the literature for the various technologies. However, in some instances, data have not been available from such sources, and it has been necessary to develop these data either through analysis or on the basis of engineering judgment. In these instances, the rationales are explained and the inherent uncertainties duly noted. Table 1 Developmental Status of the Technologies Selected for Comparison
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