Ras threshold is met-the first step in creating a map is measuring relative article share. * in order to identify areas of strength, the relative article share of each institution is calculated for each of the approximately 80,000 clusters * ras: the institutions publication level (over a 5-year period) divided by the largest publication level of any other university * ras must be greater than a specified threshold (determined by size of institution and a sliding scale between 0.2 and 0.6) * on average, only 20% of a universitys publication are in problem areas with an ras that meets or exceeds their threshold