umn i ▁Category : Univers ity ▁of ▁California , ▁San ▁Diego ▁al umn i <0x0A> </s> ▁Advanced ▁measurement ▁approach ▁( A MA ) ▁is ▁one ▁of ▁three ▁possible ▁oper ational ▁risk ▁methods ▁that ▁can ▁be ▁used ▁under ▁Bas el ▁II ▁by ▁a ▁bank ▁or ▁other ▁financial ▁institution . ▁ ▁The ▁other ▁two ▁are ▁the ▁Basic ▁Ind icator ▁Appro ach ▁and ▁the ▁Standard ised ▁Appro ach . ▁ ▁The ▁methods ▁( or ▁approaches ) ▁increase ▁in ▁s oph istic ation ▁and ▁risk ▁sens itivity ▁with ▁A MA ▁being ▁the ▁most ▁advanced ▁of ▁the ▁three . ▁ ▁Under ▁A MA ▁the ▁banks ▁are ▁allowed ▁to ▁develop ▁their ▁own ▁empir ical ▁model ▁to ▁quant ify ▁required ▁capital ▁for ▁oper ational ▁risk . ▁B anks ▁can ▁use ▁this ▁approach ▁only ▁subject ▁to ▁appro val ▁from ▁their ▁local ▁regul ators . ▁Once ▁a ▁bank ▁has ▁been ▁approved ▁to ▁adopt ▁A MA , ▁it ▁cannot ▁revert ▁to ▁a ▁simpler ▁approach ▁without ▁super vis ory ▁appro val . ▁ ▁Also , ▁according ▁to ▁section ▁ 6 6 4 ▁of ▁original ▁Bas el ▁Acc ord , ▁in ▁order ▁to ▁qual ify ▁for ▁use ▁of ▁the ▁A MA ▁a ▁bank ▁must ▁satisfy ▁its ▁super visor ▁that , ▁at ▁a ▁minimum : ▁ ▁Its ▁board ▁of ▁direct ors ▁and ▁senior ▁management , ▁as ▁appropriate , ▁are ▁act ively ▁involved ▁in ▁the ▁o vers ight ▁of ▁the ▁oper ational ▁risk ▁management ▁framework ; ▁It ▁has ▁an ▁oper ational ▁risk ▁management ▁system ▁that ▁is ▁concept ually ▁sound ▁and ▁is ▁implemented ▁with ▁integrity ; ▁and ▁It