This "How to cheat at multiple choice questions" [1]
(Links to an external site.)from Donald Clarke is useful for improving quizzes.
If you are going to use Peer Assessments in your MOOC it is important to have a good understanding of Rubrics. There are two short videos below that may help as well as this short guide to "Peer Assessment in Online Courses"[2]
(Links to an external site.)from Brown University.
As an optional extra resource you might want to hear in the last video a description of a new product from Wildfire Learning described by Donald Clarke. In contrast to Brian's earlier assertion that it is easier to use multiple choice questions than short answers, Donald states that research shows that recall is better for learning than recognising correct answers and Wildfire Learning deals with the problems of mis-spelling by using a spell checker.