I assign daily homework. In order to make it more fun, I separate each class into groups of four or five students to make 'spirit teams'. I keep a 'Team Spirit' bulletin board posted on which I have sticker incentive charts for each team. After the homework is graded and recorded each day, the students are allowed to come up and get a sticker for their team and place it on their chart. At the end of each week, the team with the most stickers in each class receives bonus points. At the end of the marking period, the team from each class with the most stickers receives a pizza party. Students work hard to encourage their teammates to complete their homework. I have found this type of positive peer pressure to be quite successful for those students that need some extra motivation to do their homework regularly.