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Alternative ScenariosIn this chapter, first of all, the specifics of each use case are briefly described, before elaborating on how to develop alternative scenarios.Differentiation of the use casesUC1In UC1, where ex-ante estimation for a single RI is made, the alternative scenarios are used to check the robustness of the RI project in the defined hostregion.UC2In UC2, where two or more competing host sites are competing for the same RI and ex-ante estimation is made, the alternative scenarios have to bedeveloped for each of the opting RI regions, following the procedure of this Module – each set of alternative scenarios will be influenced and pre-conditionedby the region’s specifics.For comparing we recommend to consider stability to unexpected factors (political, economic, etc.) and the (expected) capability to manage threats orturn them into advantages.UC3In UC3 (ex-ante estimation of two or more competing RI projects in the same host region), the alternative scenarios have to be developed or each of theopting RI regions, following the procedure of this module. Diversity of alternatives will be determined by the specific features and characteristics of eachRI.UC4UC4 requires no application of this module.UC5Ex-ante estimation for an existing RI is similar to UC1, and the alternative scenarios are used to check the robustness of the RI in the future.295