2017. Techniques for Responding to Students in Discussions, Harvard University: The Derek Bok Center for Teaching and Learning. Read online
"At the heart of responding strategies is this: all students want to know that they have been heard. You don't have to agree always with what a student has said, but it's a good idea to acknowledge in some way that you have heard and understood them. The three building blocks of good discussion are: questioning, listening, and responding."