Comment by _ache_

> You can't know 200 people, but you can know 10 people who each know 10 people

You are still 100 people short to know 200 people, but I got the idea.

The 100 people limit is already know by most of teachers. Having more than 3 classes, it is mostly impossible (very hard) to have a "deep" follow up of each student. Having more than 6 classes and it is strictly impossible to follow them even in the best conditions.