The article describes the classification and evaluation of TOFD indications according to PN-EN ISO 10863 and PN-EN ISO 15626 as well as identifies, discusses and illustrates numerous examples of typical problems connected with the evaluation of indications. Special attention is paid to spatial resolution and dead zones as well as their consequences affecting the subsequent evaluation of indications occurring at different depths. In addition, the article describes potential methods enabling the verification of unclassified indications requiring additional (supplementary) tests.