"The field of Nondestructive Testing (NDT) is a very broad, interdisciplinary field that plays a critical role in assuring that structural components and systems perform their function in a reliable and cost effective fashion." This surprisingly in-depth site offers detailed information about NDT, its applications, and the technologies used in its practice. After a brief introduction, the user can choose to learn about any of six NDT methods, including ultrasonic testing, magnetic particle testing, and others. For very motivated users, each section is accompanied by a Java-based quiz.