"Earlier this week at the Practical Ed Tech Summer CampI was able to use Plickers with a group for the first time. Plickers is a neat student response system that uses a teacher's iPad or Android tablet in conjunction with a series of QR codes to create a student response system. Students are given a set of QR codes on large index cards. The codes are assigned to students. Each code card can be turned in four orientations. Each orientation provides a different answer. When the teacher is ready to collect data, he or she uses the Plickers mobile app to scan the cards to see a bar graph of responses."