electronic board for teaching. Constructivism values ??the social interaction between teachers and students and between students and students in teaching. Constructivists believe that everyone is constructing an understanding of things in the context of their own experience , so they can only understand different aspects of things , and there is no only correct understanding of things. Teaching should enable students to transcend their own understanding , see different understandings from themselves , and see other aspects of things. Through cooperation and discussion , they can make each other understand each other??s opinions .. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.