As one in the series of classroom training handbooks, prepared by the U.S. space program, instructional material is presented in this volume concerning familiarization and orientation on eddy current testing. The subject is presented under the following headings: Introduction, Eddy Current Principles, Eddy Current Equipment, Eddy Current Methods, Eddy Current Method Control and Test System Development, Special Applications, and Comparison and Selection of Nondestructive Testing Processes. High product quality and reliability in metal processing are the main concerns throughout the volume. The material is designed for use in the classroom and has practical exercise portions. Successful completion of the corresponding programmed instruction handbook is the prerequisite for receiving classroom training. Included are illustrations for explanation purposes. (CC)