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A structural design problem consists of four major axes along which the design should be considered: These are the geometry, the material, the loading and the manufacturing axes.Structural optimization technique typically consider displacement or forces as design criteria (or constraints) while shapes, member dimensions or material properties are considered as variables.This leads to optimized structures which fulfill the design criteria in a deterministic manner (ignoring everything the design-or the model-has not taken into account).Indeed the first three axes play a major role and provide valuable information, however, the fourth axis is often neglected.In practice, most manufactured objects deviate from their perfect design and it is this deviation which corresponds often to a surprise in the end products assumed function.The optimal decision when designing a structure is not whether it is optimal or not with respect to some deterministic variables or hypothetical criteria but whether the real structure corresponds closely or to the optimized design, once manufactured i.e., whether the principal functions of the design are robustly optimal or not.