The expertise appraisal of noise deafness takes a great amount of experience for granted, since faulty interpretations are very numerous. Considering possible errors and false interpretations the following points will be discussed: anamnesis-elevation, interpretation of noise-measurements, audiometric examination including aggravation, execution of conversational speech hearing examination and its possible sources of error, tone audiogram, language audiogram and SISI-test, the coupling of the degree of deafness and the MdE (reduction of work capability), overassessment and underestimation, consideration of tinnitus and recruitment, separation of war-connected and skull-traumatic hearing loss, the "retroactive clause", substantial worsening as well as re-examination dates. Furthermore, some examples of typical faulty medical opinions will be reported upon.