~~Level I - Programmed Instruction Books
This entry level material is designed as self-study instruction with quizzes at the end of each chapter to reinforce learning. The "Introduction to NDT" book (PI-1) should be read prior to starting any of the other books in the series. About 10-12 hours is required to complete each volume of Programmed Instruction (PI) text. Written examinations suitable for Level 1-11 qualifications are included in the PI series. Level II qualifications must also include questions addressing specific applications.