Like other International certification, it needs standard documentation which conforming to the requirements of Conformity Assessment of certifying bodies as per ISO/IEC 17021 2015. The ISO 17021 Accreditation to Certifying Body is a procedure by which an accreditation body gives formal recognition of technical competence for specific system certification based on third-party assessment. So this is helpful for iso 17021 consultancy and/or any organization to establish linkage of requirements vs documents.
This is a good guide for internal audit to ensure the system is meeting ISO17021 requirements.
This describes the system at the macro level.