The letter of model recognition should be specific. It will set out the products covered, the method for calculating capital requirements on the products and the conditions of model recognition. In the case of pre-processing models, the bank will also be told how the output of recognised models should feed into the processing of other interest rate, equity, foreign exchange and commodities risk. The conditions of model recognition may include additional reporting requirements. The CBB's prior written approval should be obtained for any modifications proposed to be made to the models previously recognised by the CBB. In cases where a bank proposes to apply the model to new but similar products, there will be a requirement to obtain the CBB's prior approval. In some cases, the CBB may be able to give provisional approval for the model to be applied to a new class of products, in others it will be necessary to revisit the bank.