Functional validation is widely acknowledged as a major bottleneck in SoC design methodology due to combined effects of increasing design complexity and reduced time-to-market. To reduce validation complexity, it is necessary to develop efficient techniques for high-level validation and automated reuse of validation efforts between abstraction levels. This book presented a top-down methodology for automatically generating directed tests from high-level specifications for functional validation of both specification and implementation. The proposed methodology can drastically reduce the overall design and validation effort of complex SoC architectures. This chapter summarizes the ideas presented in previous chapters and outlines future research directions.