The PRIMED model is an acronym for six design principles for school improvement that integrate 42 character education effective practices for schools identified in studies, reviews, and meta-analyses from the last quarter of a century. Effective means that these practices are supported by scientific evidence, including statistical tests of the significance of their impact in character development. Rather than specific practices or strategies, these principles are six reminders of what should be considered to design each practice and strategy to effectively transform educational institutions into communities that cultivate moral and civic virtues in strategic and intentional ways.