The document summarizes key findings from a survey of 2,500 school leaders and teachers on how data is used in schools. It finds that while data is generally used to support improvement, secondary school teachers are least positive about its use. Data leaders play an important role in interpreting and communicating data to other staff. Challenges include encouraging data literacy, preventing misuse, and avoiding overwhelming staff with too much data. Focusing on high-quality assessment data, tailored dashboards, and an ongoing training program are identified as effective strategies.