Recommended Practice No. SNT-TC-1A: Personnel Qualification and Certification in Nondestructive Testing (2016) Recommended Practice No. SNT-TC-1A provides guidelines for employers to establish in-house certification programs for the qualification and certification of nondestructive testing personnel. Since 1966, employers have used this industry-valued document as the general framework for their NDT certification programs. ISBN: 978-1-57117-379-9 (print) ISBN: 978-1-57117-382-9 (ebook)