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3332 is developed that will be applied to all criteria, Once these two items are identified. the preference relationship is established by developing the relationship between the measure (generally shown on the "x" scale of a two-dimensional plot), and the common preference rating scale (generally shown on the "y" scale), The preference relationship can be a linear, bi-linear. step, hyperbolic, or other appropriate function, The final step is the development of weighting factors for each functional level within the hierarchy, The weighting factors are assigned in the range of 0 to 1.0, To provide the necessary mathematical integrity within the model, the sum of the weights assigned to each variable emanating from a node within the decision tree must equal \.0, For example. the sum of the weighting factors for all goals must equal \.0, Likewise, the sum of the weighting factors for each subgoal under a particular goal must also equal \.0, A composite weight indicating the relative importance of each measurable criteria can be developed by the following equation: CCW = GW x SW x OW x CW where GW, SW, OW. and CW represent the weighting factors for the related goal, subgoal. objective and criteria, Preparation of a functional hierarchy including the definition of criteria and their corresponding measurement systems represents a management framework that should guide the data gathering requirements for preparation of the EIS, Hence, the development of the DSS including the hierarchy should be developed as early as possible during the EIS process in order to prevent unnecessary and inefficient data gathering efforts. Based on our experience with other water resource projects and our understanding of the general institutional and environmental setting of the Greybull River basin, we have prepared a preliminary hierarchy for guiding future EIS work for the project. This functional hierarchy is shown on Figure 5, I, This hierarchy includes four overall project goals including: I, Minimize Environmental Impacts 2, Minimize SociaIlEconomic Impacts 3, Maximize Sponsors Operational Effectiveness 4, Minimize Overall Project Costs The four functional levels within the model result in nineteen functionally independent criteria, We recommend the EIS scoping process be initiated with this hierarchy. It should be appropriately modified based on input from the scoping process, including comments from Federal and State jurisdictional agencies. 94071\REPORT\1EXT.VI 5-2