My hubby is a lawyer and composed this homework voucher for me. The students earned the coupons throughout the year and were able to turn them in at any point throughout the year. I loved giving them the opportunity to be responsible with keeping up with them (trust me, NO ONE lost theirs!) and seeing what they would turn them in on. I did have them write their name (in pen in cursive, ha!) on theirs so no one could use one that didn't belong to them.
Great motivational tool!