In response to the comment about doing the RAT process with a large class: I do TBL / RATs with a class of 80 undergraduates. Students take the quiz on hard copy, then record their answers using iclickers. This allows them to use hard copy for reference in the team RAT. Teams use if/at cards to take the second quiz. The chance argue about and agree on an answer, finding out immediately (scratching the if/at) that the answer's is incorrect, consistently spurs interesting learning exchanges.