Effective use of data is key to improving student outcomes. This requires leaders to ensure teachers have developed the skills to convert student data to useful information to effectively plan for instruction and student interventions; to hold collaborative discussions that are structured for these purposes; to broaden the view of data to include student papers, products and performances; and to broaden the view of assessment to include assessment on the fly. This article discusses a team approach to using student data. It features a team at Moreno Valley High School in the Moreno Valley Unified School District, which, for four years, has collaboratively planned lessons. Responsibility rotates from teacher to teacher for developing the upcoming week's lesson plans for the team, often assisted by one of the department co-chairs, who also serve as coaches.