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This document specifies the activities and responsibilities of the AM operators in the field of the additive manufacturing (AM) technologies dealing with metallic parts production. This document is intended to provide guidance for qualification of AM machine operators in general industrial applications. Where industry-specific requirements exist for the qualification of AM operators, such as ISO/ASTM 52942 for aerospace applications, those industry-specific standards are used instead of this document. The responsible German standardization committee is Joint Working Committee NA 145-04-02 GA "Additive Fertigung - NWT & NAS Gemeinschaftsarbeitsausschuss Metalle" ("Additive Manufacturing - NWT, NAS & NL Joint working committee Metals and Aerospace") at DIN Standards Committee Technology of Materials (NWT).