Changes were suggested that will allow EPA's Hazardous Ranking System (HRS) to provide a more accurate and scientifically based estimate of the relative risk of candidate uncontrolled waste sites. A revised HRS, better designed to evaluate sites by relative risks, will provide an improved mechanism for determining which sites should be included on the National Priorities List (NPL), and can potentially provide useful input to the subsequent prioritization of NPL sites. Most of the changes needed to improve the current HRS are changes in the risk variables assessed and in the overall algorithm, not changes with vast new data requirements.