I have eight different classes in a two day cycle and sometimes found it a burden to manage make up work for absent students. Now I put work on overhead transparencies so I can hand the appropriate transparency to a student to copy when he/she returns from an absence. This way the student gets the work without interrupting the rest of the class. Last year I stored all my transparency assignments in a notebook. Now, as I teach a particular topic, I can use some of my original assignments that I've revised to suit this year's classes. The transparency is very easy to erase and edit. I've also found that tests can be done in the same way with the added benefit of saving on expensive photocopy paper.