Science 1 October 2010: 18-19.
To be sure, NRC does rank programs—but oh so carefully. Instead of assigning a single score to each program in a particular field, the assessment ranks the program on five different scales. Each score is also presented as a range of rankings reflecting the 5th and 95th percentiles of the scores it received. The scales themselves are based on 20 characteristics (see table, p. 19) that the NRC panel deemed appropriate for a quantitative assessment. Two are supposed to portray the overall quality of the program—one derived from a reputational survey (the R scale), the other from a quantitative analysis (the S scale). Three others rely on subsets that address important dimensions of quality: research activity, student support and outcomes, and diversity. The report itself highlights the uncertainties generated by such an exercise by calling the results "illustrative rankings [that] are neither endorsed nor recommended by the NRC as an authoritative conclusion about the relative quality of doctoral programs."report's Excel spreadsheets are available at www.PhDs.org or www.nap.edu/rdp.