The SNT-TC-1A Interpretation Panel was established to respond to written inquiries about Recommended Practice No. SNT-TC-1A, Personnel Qualification and Certification in Nondestructive Testing. Following are responses by the panel to inquiries submitted from 1976 through 2017. The responses clarify the intent of ASNT’s Technical and Education Council, Standards Development Committee and the recommendations of SNT-TC-1A. Inquiries are numbered to include the year of the inquiry and always refer to the edition of SNT-TC-1A in effect in that year, unless otherwise stated in the question. New editions of SNT-TC-1A were published in these years: 1968, 1975, 1980, 1984, 1988, 1992, 1996, 2001, 2007 (2006 edition), 2011 and 2016. Users of SNT-TC-1A are reminded that the document is intended as a guideline for employers to establish their own written practices for the qualification and certification of their nondestructive testing personnel. The responses of the SNT-TC-1A Interpretation Panel are clarifications of intent and are subject to the statement of “Scope” in each edition of SNT-TC-1A, such as the 1980 edition, Paragraph 1.4, “It is recognized that these guidelines may not be appropriate for certain employer’s circumstances and/or applications. In developing a written practice as required in Paragraph 5, the employer shall review the detailed recommendations presented herein and shall modify them as necessary to meet particular needs.” ISBN(s): ISBN: 978-1-57117-443-7 (print) ISBN: 978-1-57117-444-7 (ebook) 9781571174437 9781571174447