Use this slip each time a student comes to class without their homework. Print on colored paper, cut in half (there are 2 forms per page), and leave in a bin somewhere in your classroom.
Anytime a student does not have homework, have that student get a slip and fill out his or her name, class, date, and what the assignment was. Then have him or her check off the reason for not having the homework completed and sign it. Place the slip in the student's personal file as documentation of the missed assignment.