For a century, most students have advanced from grade to grade based on the number of days they spend in class, but in New Hampshire, schools have moved away from "seat time" and toward "competency-based learning," which advances students when they have mastered course content. This report profiles how two high schools in New Hampshire made this shift and examines the changes that were necessary to make competency-based advancement an important part of New Hampshire's strategy for implementing the Common Core State Standards and ensuring that students graduate ready for college and a career.