About GreatSchools' ratings system and methodology
The Student Progress Rating (also known as "growth") measures whether students at a school are making academic progress over time. Specifically, the Student Progress Rating looks at how much progress individual students have made on reading and math assessments during the past year or more, how this performance aligns with expected progress based on a student growth model established by the state Department of Education, and how this school's growth data compares to other schools in the state. This data is less common for high schools, which in many states do not take state standardized tests in more than one grade. It is also important to note that it is possible for schools with already-high-performing students to receive a high Student Progress Rating, or for schools with high test scores to receive a low Student Progress Rating. The key advantage of growth is that it's less correlated with socioeconomic background than proficiency. The goal of the Student Progress Rating is to provide transparency into schools that are improving student outcomes regardless of the student's starting point in terms of academic achievement.
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