Technical documentation is a very broad word used in tender documents/Scope Documents. They put the heading as Technical Documentation and in brackets write IETM Level 4 or IETM Class 4. https://www.codeandpixels.net/blog/documentation-standards-vs-ietm-standard-eed-s-048-dme-452-ncd-1470-jss-251-jsg-0852/