This book presents a detailed description of the most common nondestructive testingNDT techniques used for the testing and evaluation fiberreinforced composite structures during manufacturing andor in service stages. In order to facilitate the understanding and the utility of the different NDT techniques presented the book first provides some information regarding the defects and material degradation mechanisms observed in fiberreinforced composite structures as well as their general description and most probable causes. It is written based on the extensive scientific research and engineering backgrounds of the authors in the NDT and structural health monitoring SHM of structural systems from various areas including electrical mechanical materials civil and biomedical engineering. Pursuing a rigorous approach the book establishes a fundamental framework for the NDT of fiberreinforced composite structures while emphasizing on the importance of techniques spatial resolution integrated systems analysis and the significance of the influence stemming from the applicability of the NDT and the physical parameters of the test structures in the selection and utilization of adequate NDT techniques.The book is intended for students who are interested in the NDT of fiberreinforced composite structures researchers investigating the applicability of different NDT techniques to the inspections of structural systems and NDT researchers and engineers working on the optimization of NDT systems for specific applications involving the use of fiberreinforced composite structures.