I use these to help keep track of missing homework assignments and to help students stay accountable with their homework. When students did not do their homework, they get one of these slips and fill out all of the information on the slip; then they put the filled out form in their class's designated folder. There are multiple reasons that students can choose or they can write in their own. They then must sign the form. The students can earn back half points for their homework by turning in the assignment within two weeks.
After a few weeks of reminders, the students are used to the system and do it without prompting. I find that this cuts down on interruptions during the homework checking time.
I keep these slips in their personal student folders, so I can keep track of patterns for individual students and can show parents if they ask about it.