<p>The Tour Guides definitely tell everyone that all classes of that size are required to break down…it wouldn’t surprise me if professors are actually required to but not everyone does - after all, many departments break the rules on what undergrad TAs are allowed to do, after all.</p>
<p>However, I must argue that there are a decent number of classes of over 100 students that do not break down into sections (I was the head TA for one last term).</p>