Idea: A Rotating Classroom Roster

 This is a nice looking pie chart you can make and update at any time.  You can print it out on A4 and put it in 2 spots in your classroom, or print A3 and put it somewhere central.  Find enough jobs and your class will only get to do one job twice a year.  You can also change percentages so some students share the bigger jobs (like clean up outside).