Presented by: Robert Branson To combat increased simulation times, it is common practice to divide the board and multi-pin connector models into separate simulations that are then cascaded. This practice introduces impedance and crosstalk inaccuracies between simulation and measurements. This presentation demonstrates the differences through correlated simulation/measurement models. Field plots are used to show the inaccuracy created by the artificial simulation boundary. Then we study efforts to devise mitigation strategies to decrease simulation time while avoiding simulation inaccuracy, though the best solution often comes to a monolithic simulation.