I made up some role cards for group work that state the title and the job that student is in charge of---things like materials manager, facilitator, timer, reporter, etc. I won't use every card with every task, but will copy and laminate them, so that I can pass out the appropriate ones as needed. I've attached the copy in Word so you can edit as needed.
This is the link I used to get the template--it's great for game cards, task cards, etc!
http://www.donnayoung.org/homeschool...game-cards.htm