This report summarizes the assumptions, indexing procedures, and data used by the Economic Research Service to update to 1990 figures 3.3, 5.3, 5.4, 5.6, 5.7, and 6.6 of the 1986 Grazing Fee Review and Evaluation as mandated by Congress in 1991. This report is a follow-up explanatory document to the 1992 updated report and assumes the reader is familiar with both the 1986 grazing fee report and the 1992 updated report.