This is the easiest system I have created in all my years of teaching!
Students are responsible for their task for the week.
I love this because students become confident with their role for the week and look forward to the added responsibility daily.
I give every child a number and I add a little number or child's name on a magnet and place it onto the job the child is responsible for.
One chart that you can use year in year out.
This chart is A3.