Formative Assessment Idea:
I'd like to combine Concept testing with student vote interaction. The purpose of the concept test would be to acquire a percentage graph of the class understanding versus individual understanding. A concept test could be a low-stakes interaction to ease the student into participation with the larger class. Students would be able to view and vote for the answer they feel is correct. (i.e., Similar to the audience question poll in "Who Wants to be a Millionaire" TV game show).
Articles on the Learning Benefits of Electronic Voting for Students & Concept Tests: