@Liz-du-Plessis
Merely changing the module an assignment is in should not cause any discussions to be lost. For the most parts, modules are a way of organizing things -- some of those things might be assignments. I went in and put a completed discussion into a locked module and the previous submissions still show up in the gradebook and in SpeedGrader.
What may cause a grade to disappear is changing who it is assigned to. This can happen with mastery paths or differentiated assignments.
Differentiated assignments are assignments that are only assigned to certain sections, students, or groups. The notes on differentiated assignments say that the students can only view assignments assigned to them and that the cells are grayed out in the gradebook and grades cannot be assigned.
The same experience is true for SpeedGrader. You do not see anything for students who are not assigned that assignment. I just had a small team discussion this last week and it only shows me the people that were assigned that particular version of the discussion (each discussion was a separate assignment).
If I remove a student from an assignment then I can no longer see their discussion within the gradebook or SpeedGrader. However, if I go into the discussion itself, their replies are still there.
Adding that student to a different discussion will not cause their posts to transfer since it is a completely different assignment. You would be able to see that student's name in SpeedGrader, but not their work. They have no work for the new assignment, it's all with the old assignment, but since that's no longer assigned, you cannot see it in SpeedGrader or the Gradebook.
If I go back and re-assign them to the discussion they were originally in, then it shows me their responses in SpeedGrader and the Gradebook.
If you are using Mastery Paths, then it uses differentiated assignments behind the scenes and if they go down a different path, their discussion may seem to disappear everywhere except for in the actual discussion. If you're not using Mastery Paths, then you should know whether you changed who was assigned something.
I don't use Mastery Paths, so I do not know whether changing requirements for a module that locked the student out of an assignment used to determine paths then prevents assignments that might be used in the path. If you're not using Mastery Paths, then you don't need to worry about it. If you are using Mastery Paths, the documentation says to make sure you have everything set up before you publish the course.
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