Of those factors influencing student achievement within a school, teacher effectiveness is the most significant. As the pace of education reform quickens, this guide for legislators offers a road map as they continue to support and improve educator effectiveness in the areas of: teacher and principal preparation; licensing, recruitment and retention; induction and mentoring; professional development; and educator evaluation. Each section features an overview of policy, lists questions legislators might ask about their own state's policy, offers policy options states are considering, then lists additional resources. Created by the National Conference of State Legislatures, the guide encourages legislators to approach teacher and principal policy within the same context, to consider policies within the larger career continuum rather than piece by piece, and to ask how a change in one area might affect another. This information is from Education Commission of the States.