"At year-end 2012, 36% of all Vanguard participants were solely invested in an automatic investment program -- compared with just 17% at the end of 2007. Twenty-seven percent of all participants were invested in a single target-date fund; another 6% held one traditional balanced fund; and 3% used a managed account program.... Because of the growing use of target-date options, [Vanguard anticipates] that 55% of all participants and 80% of new plan entrants will be entirely invested in a professionally managed allocation by 2017."  MORE >>