What I typically do with discussions is to tell students that they must make them by Friday, 11:55PM (as an example.) I set the "Ratings to" date to Saturday, 00:00AM (just after midnight). With this method, if the student posts after 11:55PM, I will not be able to Rate it (meaning, their post was late and they don't get points.) I also tell students that they have to make 4 or 5 good posts, and I then provide 0,1, or 2 points for each of their posts, and I use "Sum of Ratings" to add these up and put their points automatically into the grade book. Works great.
The problem that I propose fixing is that I really believe that the Due Date, meaning Friday 11:55PM, should be set when I am editing (and defining) the forum. Right now, I have to remember to go the the Calendar and manually enter this Due Date. So I think a third date in the forum configuration, such as simply "Due Date," or less simple "Calendar Due Date" should be added.
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