Excerpt: Retirement plan providers have started taking steps to make sure that target-date fund investors don't suffer the retirement version of [a vacation debacle where you only have enough money for five days of your seven day vacation]. They're reassessing the design of the all-in-one funds in an attempt to match them to investors' needs. Likewise, they're studying investors' behaviors to look for holes in prevailing theories about how people use their retirement accounts. 'You have to make sure that, first and foremost, you think about the solution you're trying to generate for a retirement plan's participants,' says Anne Lester, a senior portfolio manager with JP Morgan Asset Management who has done extensive research on target-date funds. 'The goal should be to maximize the number of participants who reach their finish line.'

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