What is a back channel?
The short answer is that a back channel is a digital forum through which students can share ideas and post questions while another activity is happening in your classroom. For example, when I give mini-lectures I create back channels through TodaysMeet. Through that forum students can post questions as they come up. I also use back channels when students watch news clips and or documentaries. Students ask their clarifying questions and I respond to them while the students are watching the video. For some ideas on using back channels in elementary school classrooms, read this article that I posted last year.
These are the slides that I use when running workshops about using back channels in your classroom.
Backchannels in the classroom