This document discusses various methods for analyzing risk and uncertainty in investment projects, including sensitivity analysis, scenario analysis, decision tree analysis, and simulation analysis. It provides examples and explanations of each method. Sensitivity analysis involves changing assumptions individually to see how the net present value changes. Scenario analysis examines the impact of alternative variable combinations on NPV. Decision tree analysis visually represents choices and probabilities. Simulation analysis considers interactions between variables and generates a probability distribution of potential NPV outcomes.