A Sensitivity and Risk Analysis step is available but not required. Whether or not to perform this step depends on the level of certainty in the estimates used for various input parameters, and the level at which those parameters may affect the project's financial viability.  This step is divided between two sections, the Sensitivity Analysis and Risk Analysis.  Each correlates key parameters and the relevant financial figures and highlights the most impactful parameters.

Both analyses are informational only and do not affect the data or results of other steps.

Source: www.retscreen.net