Don't even ask about the late card system

Pop quiz: How many detailed seating charts does it take to sort out a class of three adults?

A) Um, seating chart?

B) One at the entrance to give a sense of organization

C) One at the entrance, one at the teacher's desk, and one at each seat, each oriented to be right-side up for its own viewer.

Pencils down. The correct answer is C - but that's only partial credit. For full marks, you should have written in "and one man to come check that everyone has found his seat."