The document discusses two potential areas of 401(k) plan litigation: excessive payments to service providers and high expense ratios of mutual funds. If plan sponsors fail to properly evaluate service provider payments and fund expenses, it could lead to litigation. Additionally, if a case reaches the Supreme Court regarding fiduciary responsibility to monitor fund expenses, it could increase scrutiny of plan sponsors' practices. While revenue sharing to pay for plan costs is allowed, amounts must be reasonable and fund expenses appropriate relative to plan size. Overall the article advises plan sponsors to focus on these issues to manage litigation risks.