(1) An insurance undertaking or reinsurance undertaking shall have a regular cycle of model validation which includes monitoring the performance of the internal model, reviewing the ongoing appropriateness of its specification, and testing its results against experience.

(2) The model validation process shall include an effective statistical process for validating the internal model which enables the undertaking to demonstrate to the Bank that the resulting capital requirements are appropriate.

(3) The statistical methods applied shall test the appropriateness of the probability distribution forecast compared not only to loss experience but also to all material new data and information relating to it.

(4) The model validation process shall include an analysis of the stability of the internal model and in particular the testing of the sensitivity of the results of the internal model to changes in key underlying assumptions. It shall also include an assessment of the accuracy, completeness and appropriateness of the data used by the internal model.