The propagation of elastic waves through materials and their interactions with flaws are fundamental phenomena underlying many nondestructive evaluation techniques. Over the past decade, considerable research has led to a good understanding of these phenomena for isotropic materials. For example, it is now possible to predict the absolute signals that will be observed when flaws of simple shapes, e.g., circular cracks or spherical pores, are examined in an immersion test through planar or cylindrically curved surfaces [1]. These models have now been used to successfully predict the probability of detection (POD) [2], an important figure of merit of a practical inspection, and it has been suggested that this capability will find important applications in a) the validation of existing NDE techniques, b) the design of new NDE techniques, or c) the consideration of inspectablility in part design [3,4].