Students have to write in a log every time they do not turn in their homework on time and explain themselves. This helps teachers keep track of how many times the same student does not do his/her homework, makes students think about why they did not do their homework, and establishes accountability.
Classroom management. This is actually a really cool idea. It would really help during study hall attendance when 6 kids came to you with a note to go to another class! I can coordinate the numbers with my cell phone storage numbers too.