"Because of the way the Coursera platform is constructed, such wide-ranging decisions have been hard-coded into the software—decisions that seem to have no educational rationale and that thwart the intent of our course. "

and

"When I wanted to make the penalty for not completing peer review a 100-percent deduction per assignment, the Coursera support team responded that the maximum deduction could be only 20 percent. Coursera acknowledged that other instructors had complained about the penalty figure but gave no indication as to when or whether the problem would be addressed. Predictably, many students have not completed the peer review, leaving others with little feedback. In my opinion, the instructor, not the platform, should determine how an assignment is evaluated." – (xmooc )