Hi Maria:
If a teacher gives the whole class an EC assignment, why not just make it a required assignment?
Nonetheless, as long as policies and parameters about grading, due dates, and that sort of thing are outlined in the beginning of the course, no one can claim "the rules were changed" or "it's unfair to get a lower grade if I don't do the EC assignment".
For me, I just don't allow it and I don't have to make up special rules.
Regards, Barry
