This document discusses using data to improve schools. It provides examples of how two principals, Dr. Baxter and Mr. Vetter, used data to better understand their schools. At Ferrucci Junior High, Dr. Baxter and her team analyzed test scores and enrollment data to see which groups were underperforming. They found low-income students and Hispanic students scored lower. At Glacier View Junior High, Mr. Vetter's team used teacher and student surveys alongside test data. This revealed teachers had false assumptions about students' literacy that were contradicted by the data. Both schools were able to make positive changes by collaboratively analyzing multiple data sources. The document emphasizes the importance of collaboration and using data to inform instruction and