BCBS - Sound practices for backtesting counterparty credit risk models

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"This document sets out the principle terminology used in IMM
backtesting, discusses backtesting and presents examples of IMM
backtesting good practice. Given the intimate relationship between
backtesting and validation, this document also lays out other sound
practices that banks should consider in conjunction with backtesting."

IMM are banks which have been approved to use internal model to
estimate counterparty credit risk capital.