Using certainty-based marking
From MoodleDocs
Certainty-Based marking (CBM)
- After each answer, you say how sure you are that your answer is correct.
- This is on a 3-point scale: C=1 (low), C=2 (mid) or C=3 (high)
- We don't rely on words like 'sure' or 'very sure' because these mean different things to different people
- The mark scheme and the risk of a penalty determine when you should use each C level:
How CBM works
- Certainty levels 1, 2, 3 always give you marks 1, 2, or 3 when you are correct
- If you are wrong, then unless you opted for C=1 you will lose marks: -2 at C=2 and -6 at C=3
Why use CBM?
- To make students think about how reliable their answer is
- To encourage students to try to understand the issues,not just react immediately to a question
- To challenge: if a student won't risk losing marks if wrong then they don't really know the answer
- If a student is a careful thinker but not very confident. they will gain in confidence
- It is more fair - a thoughtful and confident correct answer deserves more marks than a lucky hunch
- Students need to pay attention if they make confident wrong answers: think,reflect, learn!
- Efficient study requires constantly questioning how our ideas arise and how reliable they are.