This is a great way to document behavior on a daily basis. You can use it as a strike system for your students. I have included one sheet with the codes I use, and one sheet that has an empty code area where you can write in your own. I only had enough room from 22 students. (Hopefully that will accommodate your classroom size if you are interested in using this).
I print this off front and back and use it each week. It gives me documentation of behaviors so I can go back and look or even show parents if I have a consistent behavior problem. Once I fill both sides up, I punch holes in it and stick it in a 1 inch binder to keep for documentation. It is also great to use as a way of keeping up with students who are absent.