Investment evaluation on infastruchre requires careful analysis and should consider risks and uncertainties due to its unpredictable outcomes. Risk derives from our inability to see into the future, and indicates a degree of uncertainty. This paper presents the alternative approach- Sensitivity Analysis- in evaluating the most critical variables of risks which influence the investment decision on toll roads. @RISK makes it easier to see the impact of uncertain model parameters on the results and offers a powerful analysis technique for selecting between available alternatives. An advanced sensitivity analysis using Tornado Graph or Spider Graph will give the same information on the changing of the outputs.
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