Vanguard research teams found success by defaulting clients into an auto-increasing annual contribution rates of retirement plan participants. Further research was done to see how "nudges," persuasive methods to get users to take actions that were in their own best interests, could be effective.
The highly-influential book "Nudge: Improving Decisions about Health, Wealth, and Happiness" popularized this research and impacted a number of efforts in public policy.
Inspired by these results, user interface elements were designed to persuade participants to take action on their retirement plans. Part of my work included supporting the design, front-end development and research of the features to evaluate the usability and effectiveness of these designs. These designs were mentioned in the Wall Street Journal - Read full article archive (Adobe PDF).