This document discusses the use of multiple data sources to inform instruction and principal evaluation. It provides an overview of Criterion 3 which focuses on recognizing and seeking out various data sources, analyzing and interpreting data to guide school improvement efforts, and assisting staff to use data to modify teaching and learning. Specific data on demographic changes and performance at Everett High School is presented, including comparisons to other high performing schools and longitudinal staff perception surveys. Resistance to change and accountability is also examined.