In addressing this question, I will first explain why we propose to implement the advanced methods and how we see this working. Then I will address why, for reasons perhaps unique to the United States, we do not believe introducing the other options is necessary here.
4  BIS Review 18/2003  In the United States, we concluded that the greatest potential benefit of Basel II was found in the most advanced versions--the Advanced IRB for credit risk and the AMA for operational risk.