CBB may issue guidance to banks on how the tests to be used for this purpose should be designed, bearing in mind conditions in the Kingdom of Bahrain. The results of the stress test may indicate no difference in the capital calculated under the IRB rules described in this section of this chapter if the bank already uses such an approach for its internal rating purposes. Where a bank operates in several markets, it does not need to test for such conditions in all of those markets, but a bank must stress portfolios containing the vast majority of its total exposures.