Clear explanation of Certainty Based Marking (sort of advanced negative marking). This option is now available in Moodle but the add-ons designed by Tony Gardner-Medwin at UCL look to be far more accurate and effective.
Perhaps some of the language is a little tricky for my students but I do like the idea that it makes multiple choice questions more effective and therefore more justifiable for their use in other subjects.
To download the add-ons and try out the CBM package for all Moodle types click on the link: http://www.tmedwin.net/cbm/moodle/
Now to get it added to our platform and test it out....