To ensure that teachers can contact students and students can download files, it is recommended that you use multiple tools to communicate with students, such as Google Classroom, TsudaNet portal, and email. (Please decide on the main tool to use so that it is not confusing. We would appreciate it if you have a plan to deal with the situation in case the student's network becomes unstable or the equipment breaks down. (For example, to allow late submissions under certain conditions, etc.)