This revised study guide presents a detailed overview of Recommended Practice No. SNT-TC-1A (2006). Included are inquiries and responses from ASNT's SNT-TC-1A Interpretation Panel, ANSI/ASNT CP-189-2006 and the ASNT Level III Certification Program. Also, a section is devoted to the general application of eleven different NDT methods, including topical outlines, references and method specific questions and answers, and a section on materials and processes for NDT technology. The study guide is intended to assist the candidate preparing for the Level III Basic Examination.