document camera app for iphone. The model promotes the transformation of educational governance from ??based on limited cases?? to ??based on data decision making??. In the traditional headmaster's teaching leadership, the ??principal's push-to-door system?? has received much attention, but the principal has limited energy, and it is difficult to take into account every class and class in the school. This inevitably involves the principal's selection of the sampling error of the observation class. . Establishing a normalized ??data-based decision-making?? management model enables managers to understand all classroom situations in the ??full-sample?? classroom information platform built on smart campuses, thus enabling comprehensive management of the school. It is also important not only to establish this normal mechanism at the principal level, but also to guide teachers in the rational use of data in class teaching management. For example, Kennedy Elementary School in Wisconsin, USA, conducts process education evaluations through big data technology to form a data-driven teaching model. The school teachers participate in three data mining activities each year, in-depth analysis of students' academic and physical development, and then adjust the teaching design based on these data to improve teaching activities. Practice shows that the school uses big data technology to achieve changes in management and teaching activities, effectively improving student achievement. 1. Interactive Document Camera is a completely new concept design and mobile visualizer. The touch capability on IQTouch and IQBoard, IQView E3511 Document Camera can be freely used for presentations anywhere in or out of the classroom or office.