A bank must collect and store data on key borrower and facility characteristics to provide effective support to its internal credit risk measurement and management process, to enable the bank to meet the other requirements in this section, and to serve as a basis for CBB reporting. These data should be sufficiently detailed to allow retrospective re-allocation of obligors and facilities to grades, for example if increasing sophistication of the internal rating system suggests that finer segregation of portfolios can be achieved.

Furthermore, banks must collect and retain data on aspects of their internal ratings as may be required under disclosure requirements specified by CBB periodically.