For the measurement of their market risks, banks will have a choice, subject to the written approval of the Agency, between two broad methodologies. One alternative is to measure the risks in a standardised approach, using the measurement frameworks described in chapters CA-4 to CA-8 of these regulations. The second alternative methodology (i.e. the internal models approach) is set out in detail in chapter CA-9 including the procedure for obtaining the Agency's approval. This methodology is subject to the fulfilment of certain conditions. The use of this methodology is, therefore, conditional upon the explicit approval of the Agency.