Effective teachers are the most valuable education asset that Ohio (or any state) has. Statistics don't lie when it comes to their impact on children's learning. Stanford economist Eric Hanushek, who recently testified before a joint hearing of the Ohio House and Senate education committees, reports that "having a high-quality teacher throughout elementary school can substantially offset or even eliminate the disadvantage of low socio-economic background." Similarly, a weak teacher can blight a child's prospects.
Given how powerfully teachers can alter students' life trajectories, it is not only prudent but imperative to push reforms that enable education leaders to distinguish effective teachers from ineffective ones. With a fair and rigorous system that measures gradations of teacher effectiveness - not just binary ratings such as "satisfactory" and "unsatisfactory" - school systems can reward their ablest instructors and put them in the classrooms where they are most needed, target support to teachers who need it and weed out those who are not a good fit for the profession. For Ohio, where low-income and minority children reach proficiency at far lower rates than their wealthier peers, the stakes are enormous.