1. A computer-implemented method of determining a lithographic tool set point for a lithographic process, the method comprising: providing a model of a production lithographic process including simulations of printed shapes; analyzing the model of the production lithographic process to determine whether a set of structures on a production mask used in the production lithographic process to create the printed shapes will fail under a plurality of set points, wherein the analyzing includes: determining that a set point in the plurality of set points is a failure point; establishing the failure point as an outer limit for at least one process condition; and testing another set point in the plurality of set points within the outer limit to determine if the another set point is another failure point; determining an operating region of set points where the set of structures on the production mask does not fail; and establishing a set point location within the operating region based upon a set point selection function.