Each table of 4 must discuss and agree on all answers which are then transferred to sticky notes that represent each group (this requires 8 colors of sticky notes!). I then quickly go down the line and score each group's and note which questions they need to reconsider the answer for with red whiteboard marker. A super time saver. They can then be left up until the quiz and students can read over each other's answers to get more supporting details or better justifications for answers.
I am now inspired to find the many uses for sticky notes in the classroom.