Book investigates external and self-sensing sensors for the health monitoring of composite materialsand technically evaluates sensor advantages and disadvantages in terms of robustness and signaling,as well as their suitability for structural health monitoring (SHM) in different types of composites. Theauthors explain how piezoelectric, piezo-resistive, and optical fiber sensors are fabricated, embedded, and tested under different loading conditions, with special attention to the design and signalingof piezo-resistive devices. Data and modeling are provided from tests of a piezo-resistive polymericcomposite sensor made with chopped carbon fibers and embedded in woven composites