Psychometric analysis of certainty-based marking on multiple-choice items

The University of Hasselt uses certainty-based marking for some of the exams with multiple-choice items. For each item, students choose their response and indicate their level of certainty. The final mark is effected both by the correctness of the response and the chosen level of certainty. This study investigates for six exams how first-year students physiotherapy use these answering instructions.