I am in the retirement withdrawal phase and trying to adhere to Frank Armstrong's two bucket approach; ie., keep enuf in short term bonds to cover 5 years expenses in case the markets are down and you don't want to sell stocks or longer term bonds to fund a particular year's expenses. I have funded the Vanguard Short Term Investment Grade bond fund within my IRA for this purpose. Today's yield for this fund is 3.68%. I see several CD rates for 5 years over 4%. Would it be reasonable replace this fund with a 5 year ladder of CDs or other safe DIs? Would be used solely for this annual refunding process so likeliehood that would want to sell before a particular security's due date is low. Can anyone point to data where could compare returns or perhaps someone has already done some analysis? The NAV on this fund is relatively stable, but even if return is a wash I am attracted to knowing exactly what will be available each year and the preservation of principle.... thanks! bill