But I thought I knew that: using confidence estimation as a debiasing technique to improve classroom performance

Our assessments of how much we know about a particular topic can be affected by our confidence in our knowledge. Research in judgement and decision making has shown that people are generally overconfident in their judgements or decisions, and that this bias can be reduced with training. We present two studies designed to assess whether debiasing can be accomplished in a classroom setting and whether it has practical value for students. In Experiment 1 simply providing confidence estimates as questions were answered was enough to debias students in a series of course-related quizzes. In Experiment 2, weekly quizzes were given in a computer-administered format. Students were given feedback for each question as it was completed. We found that accuracy on quizzes improved as confidence declined. We also found that students performed better in the course when they received debiasing training. We suggest that debiasing training prompted students to develop and use metacognitive skills that allowed them to assess their knowledge more accurately. Given this, training for these skills has practical value in the classroom. Copyright © 2001 John Wiley & Sons, Ltd.