Simulations of ITER discharges, which have been carried out using a variety of integrated modeling have predicted a wide range in the fusion performance for ITER. One of the factors contributing to the prediction of the wide range in ITER performance is the stiffness of the anomalous transport model used in the Stiffness refers to the rapid growth of the driftwave turbulence transport with increasing temperature gradients above a threshold temperature gradient. Transport driven by drift-wave turbulence, which accounts for most of the anomalous thermal transport observed in present day experiments, has been included in the simulations using different anomalous transport models such as the GLF23, MMM95, Weiland, and mixed Bohm/gyro-Bohm transport models.