The New York State Board of Regents has committed to the transformation of the preparation, support and evaluation of all teachers and school leaders in New York State, and the New York State Legislature has enacted historic legislation (Education Law §3012-c) that fundamentally changes the way teachers and principals are evaluated. Under the new law, New York State will differentiate teacher and principal effectiveness using four rating categories--Highly Effective, Effective, Developing, and Ineffective. Education Law §3012-c(2)(a) requires annual professional performance reviews (APPRs) to result in a single composite teacher or principal effectiveness score that incorporates multiple measures of effectiveness. The results of the evaluations shall be a significant factor in employment decisions, including but not limited to promotion, retention, tenure determination, termination, and supplemental compensation, as well as teacher and principal professional development (including coaching, induction support, and differentiated professional development). The law specifies that student performance will comprise 40% of teacher and principal evaluations. For teachers where there is no State-provided measure of student growth, "comparable measures" are the State-determined District-wide growth goal-setting process. Student Learning Objectives (SLOs) are the State-determined process. A Student Learning Objective is an academic goal for a teacher's students that is set at the start of a course. It represents the most important learning for the year (or, semester, where applicable). It must be specific and measurable, based on available prior student learning data, and aligned to Common Core, State, or national standards, as well as any other school and District priorities. Teachers' scores are based upon the degree to which their goals were attained. This report provides background information about SLOs, describes SLO rules and considerations for comparable growth measures, discusses scoring SLOs and determining final ratings for comparable growth measures, outlines major district steps to plan and implement SLOs as comparable growth measures, discusses SLOs as an option for locally-selected measures of student achievement, and includes sample SLO scoring models for comparable growth measures. Definitions of key terms are appended.