Stealth has become a strict design criterion for most of the airborne and naval systems that are being developed at our client organizations. In pursuit of a stealthy design, first level activity is basic shape optimization to minimize mono-static RCS for critical viewing angles. In terms of electric size, these configurations lie in optical region and therefore, methods based on PO and GO for RCS evaluation are best suited. However, results are sensitive to model preparation and choice of various options available to these methods. Being a critical design consideration, our customers desired an engagement by which all nuances of RCS prediction are accounted in a transparent manner.