For states to succeed in their efforts to improve reading instruction, they must ensure teachers are prepared to implement and sustain scientifically based reading instruction. The states most successful in leveraging policy to improve reading outcomes for students have taken a cohesive and comprehensive approach focused on improving teachers' capacity to deliver great reading instruction. This action guide outlines five key actions states should take to strengthen implementation of reading policies. Each policy action in isolation can make a difference for students. But when done in concert, these policy actions build upon and bolster the others, leading to state policies that are greater than the sum of their parts in their ability to boost reading outcomes for students. This action guide also shares stories of states that have leveraged these policy actions to support greater teacher effectiveness in reading. Each section explores how state leaders invested in teacher prep programs and teachers, the pitfalls they faced, and how they overcame them.