Editor's note: This post is the first part of an ongoing series featuring insights from the development of the Population Health Advisor's Care Delivery Innovation Reference Guide tool.

In early 2018, the Population Health Advisor (PHA) released the Care Delivery Innovation Reference Guide. The tool summarizes the evidence base and documented ROI behind key interventions. This year, we added 20 new interventions to the library, including food security services and hospice care. After reading hundreds of academic studies, PHA researchers have learned a lot about what makes—or breaks—an intervention. Here's what you need to know about one of those interventions: health literacy.