Performance prediction is a unique "pre-simulation" tool for rapid quantitative predictions and comparison of key IOR methods potential in stratified reservoirs. Displacement results are available in 2D cross-section and in an approximate 3D (5-spot) geometry. Performance prediction is based on proven analytical solutions like Dykstra-Parsons and gravity-dominated vertical equilibrium approximations. A wide range of reservoir parameters and computed results enables the user also to perform rapid but comprehensive reservoir analysis and sensitivity studies. A convenient and unique feature of this module is its capability to handle a series of cases in one single run. Error estimates for the analytical approximations allow to check the usability of the chosen approximation. The module has advanced plotting capabilities.