Another method teachers can use to determine student learning is to set questions to be completed in class. Typically a teacher might then ask a single student to explain their answer to the class. This can be an ineffective insight into the overall learning of the class, as the student picked might be an outlier, having a better or worse understanding than the class on average. In addition, should the student not know the answer, or get the answer incorrect, while it can be a learning opportunity for the class, it can cause great embarrassment to the student as their mistake is made public. Peer grading, the use of electronic clickers, self-grading, teacher review can all mitigate this but can limit the scope of the questions asked and the time for delivery.