While looking back in Training and Certification in Chemical and Petroleum industry, we see generic guideline made by ASNT-TC-1A by stating some basic requisites for qualification & certification.This qualification program were developed base on experience form pain point and lesson learn in GC and GCME company.
The obvious answer comes is ‘To judge the Competency.’ Now the competency is required for ensuring the correct testing & correct evaluation. To get this competency in testing, one has to have knowledge of testing techniques, knowledge of discontinuities expected, experience of finding out discontinuities and knowledge for evaluating these discontinuities. He shall also have the proper eyesight so that he will not miss the small discontinuities. He shall also have proper training & guidance to find out the discontinuities.