Taken from the POGIL website (Process Oriented Guided Inquiry Learning)
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STEP 1: Review your syllabus for points that should change: What will have to change in your syllabus (policies, due dates, assignments, etc.)? Since students will also be thrown off by the changes, they will appreciate details whenever you can provide them.
STEP 2: Pick tools and approaches familiar to you and your students: Try to rely on tools and workflows that are familiar to you and your students, and roll out new tools only when absolutely necessary. A closure may be taxing to everyone's mental and emotional energy; introducing a lot of new tools and approaches may leave even less energy and attention for learning.
STEP 3: Communicate with your students right away: Even if you don't have a plan in place yet, communicate with your students as soon as possible, informing them that changes are coming and what your expectations are for checking email or the platform you use for grading (Canvas, Blackboard, etc.), so you can get them more details soon. Create a detailed communication plan. Once you have more details about changes in the class, communicate them to students, along with more information about how they can contact you (email, online office hours, etc.). A useful communication plan also lets students know how soon they can expect a reply. They will have many questions.