The JCGM Member Organizations recently approved the document GUM-6 (formerly numbered JCGM 103) Guide to the expression of uncertainty in measurement‐Developing and using measurement models. It is available from the BIPM website:  https://www.bipm.org/en/publications/guides/

It is also accessible via the JCGM link on the ILAC website: https://ilac.org/publications-and-resources/non-ilac-publications/