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Today, structural analysis has been essential at the design stage. Most of the analyses done at the design stage are so simple that the designers find certain results under certain condition, with a simple material constant, at a certain loading conditions, although the material constants have scatters from lot to lot, the dimensions of the part are acceptable with some amount of tolerance in real world. So, the results lead by such analyses does not always match the actual behavior of a group of mass-produced parts. MSC.RobustDesign is a software tool based on stochastic methodology combined with a finite element analysis that makes it possible to include uncertainty into the finite element analysis. In this discussion, some case studies of reliability analysis with MSC.RobustDesign applied to the BGA creep analysis that shows highly nonlinear material behavior.