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09 April 2019

BCBS: Standardised approach – implementing the mapping process


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This document sets out guidelines for supervisors in assigning the risk assessments of an eligible external credit assessment institution (ECAI) to the risk weights available under the standardised approach to credit risk. It replicates the guidelines contained with Basel II.


Because supervisors will be responsible for assigning an eligible ECAI’s credit risk assessments to the risk weights available under the standardised approach, they will need to consider a variety of qualitative and quantitative factors to differentiate between the relative degrees of risk expressed by each assessment.

Such qualitative factors could include the pool of issuers that each agency covers, the range of ratings that an agency assigns, each rating’s meaning, and each agency’s definition of default, among others. Quantifiable parameters may help to promote a more consistent mapping of credit risk assessments into the available risk weights under the standardised approach.

This Annex summarises the Committee’s proposals to help supervisors with mapping exercises. The parameters presented below are intended to provide guidance to supervisors and are not intended to establish new or complement existing eligibility requirements for ECAIs.

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© BCBS (BIS)


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