Non-Destructive Testing (NDT) – sometimes called Non-Destructive Inspection (NDI) or Non-Destructive Examination or Evaluation (NDE) – included a variety of techniques that are used to test the integrity of a material without damaging it. Since the original material is tested without damage, non-destructive testing is recognized by many industries as a highly valuable and cost-effective technique for ensuring the materials and parts they use are free of defects.