Tracking the data on the effectiveness of employee well-being programs can feel like you’re watching a Ping-Pong match. While more than 60% of U.S. businesses offer such programs, research on their effectiveness has been mixed. There are findings that point to positive gains in both cost savings and productivity measures, while other studies, including the recent report from the National Bureau of Economic Research, find that programs can make for good recruitment tools but won’t do much to lower costs or improve health. The result: persistent questions on whether well-being programs deliver meaningful value and, if so, which ones do.