I disagree with the statement that "the degree of precision in daily volatility is much higher than that in daily return." My observations show that the one-week volatility of volatility is generally between 5 and 50 times higher than the one-week volatility (too high for the normal kurtosis). Nor do I believe that the ARCH-style modeling of heteroskedasticity that appeared to work in research papers, but has failed thus far in many dealing rooms, can be relied upon for risk management. The fact that the precision of the risk measure (volatility) is volatile and intractable is sufficient reason to discourage us from such a quantitative venture. I would accept VAR if indeed volatility were easy to forecast with a low standard error.