A teacher’s effectiveness has a tremendous impact on a child’s learning and academic trajectory. Yet knowing that, and being able to create teacher evaluation systems that successfully measure and document teacher effectiveness, are two very different things. In fact, for as long as anyone can remember, a public school teacher’s effectiveness and performance in Ohio classrooms-as in the rest of America- haven’t been measured much at all. These critical factors have had little impact on decisions about whether she is retained by her district or laid off, how she is compensated or assigned to a district’s school, or how her professional development is crafted. This report, authored by Harrison (CO) Superintendent Mike Miles, takes a detailed look at the district’s Pay-for-Performance Plan. The Harrison Plan confronted the dual challenges of defining an effective teacher then identifying all the things that demonstrate her effectiveness. This how-to guide is meant to serve as a tool and model for Ohio’s school districts.