How do you know if a mutual fund is making more money for you or its management team?For the average Joe, it's not easy. But Morningstar's ( MORN) stewardship ratings grade funds on intangibles like corporate culture, board quality, manager incentives, fees and regulatory history -- in short, how well they care for investors' capital. Over the summer, the Chicago fund-research company revamped its three-year-old grading system to give more weight to corporate culture and stop rewarding firms for simply obeying the law. Previously, all five categories provided an equal 20% of a fund's total grade. But after revamping the criteria, the corporate culture weighting in the grade doubled to 40%, because this sets the tone for everything else. Laura Lutton, a senior fund analyst at Morningstar, says corporate culture measures how closely the portfolio manager's financial interests align with the shareholders'. "Is the fund investor-driven or sales-driven? Does the manager get paid based on the fund's performance or his ability to grow assets?" She says the retention rate of fund managers is also a factor. Meanwhile, funds' regulatory histories are now graded on a demerit system. The best a fund with a clean record can hope for on the regulatory front is a grade of zero; funds that have been involved in scandals or had run-ins with the Securities and Exchange Commission will see their total grade decline.