Institutions are mandated to collect and maintain comprehensive data on their internal ratings systems as outlined in Part Eight. This encompasses maintaining rating histories, assignment dates, methodologies, and the individuals responsible for the ratings across various exposures, including central governments and corporates.

For both own estimates of Loss Given Default (LGD) and Conversion Factors (CF), institutions must document the relationships between realised figures and standardised models while also capturing detailed data on defaulted exposures and their associated loss components. Additionally, for retail exposures, robust data collection on the allocation of grades, estimated probabilities of default (PDs), and loss rates is essential.