In improving the teaching and learning experience in a classroom environment, it is crucial for a teacher to have a fair idea about the students who need help during a lecture. However, teachers of large classes usually face difficulties in identifying the students who are in a critical state. The current methods for classroom visualization are limited in showing both the status and location of a large number of students in a limited display area. Additionally, comprehension of the states adds cognitive load on the teacher working in a time-constrained classroom environment. In this article, we propose a two-level visualizer for large classrooms to address the challenges. In the first level, the visualizer generates a colored matrix representation of the classroom. The colored matrix is a quantitative illustration of the status of the class in terms of student clusters. We use three colors: red, yellow, and green, indicating the most critical, less critical, and the normal cluster on the screen, respectively. With tap/click on the first level, detailed information for a cluster is visualized as the second level. We conducted extensive studies for our visualizer in a simulated classroom with 12 tasks and 27 teacher participants. The results show that the visualizer is efficient and usable.

中文翻译：

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大型教室的实时交互式可视化工具

在改善课堂环境中的教学和学习体验时，教师必须公平地了解在课堂上需要帮助的学生。然而，大班的教师通常难以识别处于危急状态的学生。当前的课堂可视化方法仅限于在有限的显示区域内同时显示大量学生的状态和位置。此外，对状态的理解增加了在时间受限的课堂环境中工作的教师的认知负担。在本文中，我们为大型教室提出了一个两级可视化器来应对挑战。在第一级，可视化器生成教室的彩色矩阵表示。彩色矩阵是根据学生集群对班级状态的定量说明。我们使用红色、黄色和绿色三种颜色，分别表示屏幕上最关键、不太关键和正常的集群。通过点击/点击第一级，集群的详细信息可视化为第二级。我们在一个有 12 个任务和 27 名教师参与者的模拟教室中对我们的可视化器进行了广泛的研究。结果表明，可视化器是高效且可用的。我们在一个有 12 个任务和 27 名教师参与者的模拟教室中对我们的可视化器进行了广泛的研究。结果表明，可视化器是高效且可用的。我们在一个有 12 个任务和 27 名教师参与者的模拟教室中对我们的可视化器进行了广泛的研究。结果表明，可视化器是高效且可用的。