Under the CMC program, research was conducted to evaluate and determine the various factors that can contribute to dimension variation in investment castings. One key factor leading to this variation was determined to be the inability to accurately predict and model the dimensions of the injected wax patterns. The objective of this program is to test the ability of the viscoelastic stress model in a commercial software code to predict pattern dimensions during wax pattern injection for investment casting. The modeling results will be compared with wax patterns produced using a commercially available unfilled wax and a production die.  A sensitivity analysis of the modeling results to variations in input parameters and material properties will also be conducted. The resulting report will ascertain the validity of the model, and also provide guidelines for the use of the model. This should result in the ability to improve dimensional accuracy of investment cast components.