The document discusses risk analysis using payback period and sensitivity analysis. It defines payback period as the time taken to recover the initial investment of a project. It notes payback period is used to compare projects and select those with the lowest number of years. It outlines advantages like simplicity and cost-effectiveness, and disadvantages like ignoring cash flows after payback. Sensitivity analysis determines how independent variables affect dependent variables under assumptions. There are two types: local and global sensitivity analysis. The document concludes payback period measures the relationship between cash inflows and investments, while sensitivity analysis gives insight into problem considerations.