Missing/Incomplete Homework Slips four to a page and letter to parents. These are the size of index cards 3" x 5". I copy and cut a stack on colored paper. When students do not have their homework complete, I have them pick one up and fill it out. I keep them filed in a plastic index card box with the lettered dividers in it (can be purchased at Target or Walmart for under $3 each). Once they have two slips filled out, I mail them home with the included letter. It takes only a minute, and I have noticed a HUGE decrease in the amount of missing/incomplete homework assignments. I empty out the box at the end of each quarter to allow students one missed homework assignment a nine weeks without parent notification.