This document discusses measuring student growth on MCAS tests in 3 districts. It defines growth as measuring individual student improvement over time compared to academic peers. Growth is important to evaluate curriculum, target assistance and make accountability decisions. The document introduces Student Growth Percentiles (SGP) which express a student's growth as a percentile based on their improvement relative to similar students. SGPs between 40-60 are typical, with higher or lower scores indicating exceptional growth. The document provides examples of how SGPs, fan charts and scatter plots can be used to analyze growth at the student, grade and school levels to inform instructional planning.