obtaining, by a numerical injection molding simulation program, a three-dimensional model of a mold and measured shrinkage data for at least one material;

predicting, by the numerical injection molding simulation program, an amount of warpage for a part manufactured using the mold by computational simulation of an injection molding process, wherein the computational simulation uses an internal residual stress model for the part that uses calibrated values for both a coefficient of thermal expansion and an elastic modulus of the at least one material, in at least one direction, for at least thermal stress due to cooling and pressure compensation during a packing or holding phase of the injection molding process, wherein the calibrated values are calibrated in accordance with the measured shrinkage data for the at least one material; and

providing the amount of warpage predicted for the part manufactured using the mold.