A method is contemplated in which the stimulus to an IC design simulation may be automatically manipulated or steered so that the test environment is altered during subsequent simulations of the IC design based upon the simulation results and/or configuration settings of previous simulations of the IC design. More particularly, a stimulation steering tool may analyze the simulation results and/or the test environment, and manipulate the test environment, which may include the test generator output, and the test bench model, for subsequent simulations.