Evaluation of students' progress - 2 of 3
This heterogeneity is beneficial to all students. Weaker students almost always have someone stronger to help them out and give them individual attention when the teacher is busy elsewhere, while stronger students, in helping their weaker classmates, are obliged to transform a lot of passive knowledge into active knowledge, thus benefiting from the old principle that "the best way to learn is to teach."
Surprisingly, there is very little misinformation transmitted. The minute there is the slightest shadow of a doubt in the minds of students, they will automatically check with their more knowledgeable classmates or with the teacher, who is never more than a few feet away.