The video for this session examines assessment practices that measure student performance and progress, and inform instructional decisions. In her lecture, Dr. Jeanne R. Paratore reviews the principles of classroom-based assessment and engages the workshop participants in a discussion of their own assessment practices. The participants then watch and discuss a set of classroom excerpts illustrating Dr. Paratore's lecture. In the final activity, workshop participants assess a first-grader's reading and writing samples.