This document discusses using data to inform curriculum and instructional decisions to improve student achievement. It defines key terms like core curriculum, core maps, and diary maps. It emphasizes the importance of aligning curriculum, instruction, and assessments to standards and collecting various assessment data. Data should be analyzed by teacher teams to identify strengths, weaknesses, and root causes in order to guide goal setting and improve practices. Benchmark assessments administered periodically can provide useful data for progress monitoring and curriculum development. Software tools are available to track assessment data over time.