Having students raise their hands to indicate their understanding or agreement with a point is a time effective method for teachers during classroom instruction. However, a commonly frustrating experience for teachers in Japan is the reluctance of students to raise their hands in class. This can be particularly noticeable in large classes where the students do not know each other well. Many students are embarrassed to admit when they do not understand, especially if they think the rest of the class does. This creates difficulties for teachers who, in the absence of any form of feedback from the students, become uncertain as to whether to proceed with the lesson or backtrack to cover the point or instructions again.