The purpose of this chapter is twofold. The first is to discuss the validation of the SIBCs developed in the previous chapters. Of particular interest here is the experimental validation of SIBCs because analytical and numerical validations have been incorporated in Chapters 4 through 8 as part of the formulation and development of the various SIBCs. The second, perhaps more important purpose is to describe a simple methodology for the selection of appropriate SIBCs for use with any particular problem the user may need to address and, indeed, to allow a simple decision process by which the user can first decide if SIBCs are in fact appropriate for the problem at hand and then to decide on the order of approximation needed. This should aid in the practical use of the foregoing SIBCs. We start with the second of these goals.