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概要（英語）
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In this paper, we design a chat system aiming at implementing collaborative and interactive lessons in information moral education and propose the design of necessary functions to reduce the workload of a teacher. Also, when using this system in which teachers and students communicate bi-directionally in a lesson, it is necessary to support the operation method of information equipment in parallel while proceeding the lesson. For this reason, it is necessary to estimate beforehand how much time will be required for teaching as well as a large workload on the teacher. Therefore, we propose a method for teachers to know in proceed the time necessary for support to students from the viewpoint of usability while a teacher proceeds a lesson in a chat system.
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