ISO 17025

Clarifications on ISO/IEC 17025-requirements for laboratories
The above link is to the “official” ISO site providing “Clarifications on ISO/IEC 17025-requirements for laboratories”. For convenience, I've combined all of the “official” ISO 17025:2017 clarifications from ISO (as of January 2020) into a single zipped file.

European Accreditation - Application documents
Following the above link, navigate to the “Application documents” folder, and then to the “Documents to ISO/IEC 17025 and ISO 15189 - Laboratories” subfolder. In that subfolder, you will find several documents pertinent to ISO 17025. The most pertinent may be “EA-4/23 INF - The Assessment and Accreditation of Opinions and Interpretations using ISO/IEC 17025:2017”.