As mentioned in the @stemmitblog post...
The posts should be awarded a grade marked out of 10 according to how well they have completed the assignment tasks. We very much encourage teachers to design their homework assignments with a sufficient level of difficulty that they will be able to award a good spread of grades and not have everyone bunched up with 9’s and 10’s.
Teachers need to focus on making their course not too difficult and as many people as possible can join it. If the course is difficult then very few people will participate in it. It is also important to ensure that grades are given honestly and not with favoritism.
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