text_combined: var methodology change gentlemen plan action moving along var methodology change related forward forward volatility 1 finalize methodology proposed research market risk determine time period used calculated forward forward vols vs correlations 20 days vs 60 days stabilize calculation curves time periods curve change based historical prices implying volatility 0 2 get approval methodology change rick buy see draft memo attached john lavorato john sherriff 3 develop implement new methodology stage environment research 4 test new methodology market risk traders 5 migrate production research please let know reasonable meets everyone expectations vlady