The Pennsylvania System of School Assessment (PSSA) formula ranks the school districts based on three years of state standardized test scores, giving the most weight to the current year. The PSSA is a standards-based assessment of what a student should know and be able to do at varying levels in reading, writing, science and math. Reading and math is assessed in grades 3 through 8 and grade 11; writing is assessed in grades 5, 8 and 11 and science assessed in grades 4, 8 and 11. The rankings do not denote the overall quality and performance of the school district, only the PSSA scores.